Diet & Weight Loss

50 Things Your Doctor Wishes You Knew About Losing Weight

We asked doctors, dietitians, therapists, and other weight loss experts the key facts their clients most often miss. Make sure to master these oft misunderstood facts if you’re looking to shed a few pounds.

By Charlotte Hilton Andersen

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Even nutritious foods can make you gain weightmarilyn barbone/Shutterstock”Many people think if it’s healthy you can eat as much as you want, but it’s important to limit ‘recreational’ eating, no matter how healthy the snack.” (When you do snack, make sure you’re choosing the right kind; try these 30 healthy snacks.) —Fiola Sowemimo, MD, Board-Certified in Internal and Bariatric Medicine

When you eat is just as important as what you eatGeorge Rudy/Shutterstock”When you eat is important for weight loss. Starving all day and eating a big meal at the end of the day is counterproductive. No matter how nutritious a meal is, if eaten too late in the day, one does not have the time to burn it off and use it for fuel for the day. It ends up being stored in a body gas tank (the fat cells) you can’t readily access.” —Dr. Sowemimo

Check your”Some common medications prescribed for chronic conditions like hypertension, diabetes, and depression are weight positive—as in, they make you gain weight or make it difficult for you to lose the excess weight you already have. (And those aren’t the only medications that can make you gain weight.) If one needs to be on chronic medications, it’s best to be on weight neutral or weight negative alternatives. Talk to your doctor about your medications.” —Dr. Sowemimo

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Reaching your goal weight isn’t the endArtem Oleshko/Shutterstock”It takes fewer calories and more energy expenditure to maintain weight loss than it takes to initiate weight loss. So if you let up once you start losing weight, you will gain it all back and then some! The good news is that when you start losing weight, it becomes easier to do more things like spending extra time on the treadmill or doing more resistance training reps. The idea is to continuously challenge yourself.” (Make sure you’re not doing any of these nine common mistakes that make you regain weight.) —Dr. Sowemimo

You need to get your thyroid checked, the right wayAlbina Glisic/Shutterstock”If you’re having a hard time losing weight, get a proper thyroid assessment. Most people need a test that goes above the standard medical thyroid profile. A standard thyroid test reads as ‘normal’ in 80 percent of overweight individuals, which is incorrect. A proper thyroid assessment includes checking eight different parameters of thyroid function and comparing them to optimal, not normal, values. Evaluated this way, over 80 percent of overweight individuals will actually be properly identified as being hypothyroid. This is a key contributor to overweight.” (These are the silent signs of a thyroid problem.) —Kyrin Dunston, MD, author of Cracking the Bikini Code: 6 Secrets to Permanent Weight Loss Success

Alcohol literally prevents weight lossAfrica Studio/Shutterstock”Alcohol is not only empty calories but also has a huge effect on the weight loss process. It can interrupt and inhibit fat metabolism, making it harder to lose weight. Alcoholic drinks also contain a lot of added calories and carbs that will make it harder to lose weight even when you’re reducing your caloric intake. At the very least, order something you sip slowly, such as wine, rather than something you may drink larger amounts of such as beer.” (Instead, try one of these five best drinks for weight loss.) —Gabriella Vetere, registered dietitian nutritionist, founder of Macrobalanced Nutrition

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Not all calories are created equalDragon Images/Shutterstock”Calories are not just calories. There are foods that will nourish the body, preserve and protect lean muscle mass, and foster a healthy metabolism—such as lean proteins, fresh produce, and whole grains. And there are foods that will contribute calories but very little else nutritionally—such as refined grains, processed foods, and added sugars. Having a calorie limit is a good idea, but it’s critical to meet that goal with as many healthy choices as possible.” —Caroline Apovian, MD, Director of the Nutrition and Weight Management Center at the Boston Medical Center, professor at the Boston University School of Medicine, and vice-president of The Obesity Society

You have to exercise tooIakov Filimonov/Shutterstock”Exercise is important for so many reasons, with metabolic health and weight loss being only one. While it is true that focusing on diet makes more a difference in terms of weight loss, the two disciplines work together to maintain a healthy body and metabolism, especially as you age. I advise my patients to strength train twice per week and work in cardio most days of the week.” (Just can’t stand the gym? Start with these 50 ways to lose weight without a lick of exercise.) —Dr. Apovian

Sleep is the missing link in weight lossNenad Aksic/Shutterstock”I refer to sleep as the third pillar of weight loss. Getting less than 7 to 9 hours of sleep per night ramps up the hunger hormone ghrelin and decreases the satiety hormone leptin. Lack of sleep also interferes with impulse control, making it less likely that you will stick to healthy food choices and portion sizes the following day. Getting less sleep than needed also heightens cortisol, which prompts the body to overeat to refuel after fighting off a stressor.” —Dr. Apovian (This is what happens to your body when you don’t get enough sleep.)

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Muscle may weigh more, but it works in your favorBojan Milinkov/Shutterstock”The amount of lean muscle mass we have is the primary determinant of metabolic rate. In other words, the more muscle mass we have, the more calories we will burn. Our muscle mass naturally begins to decline around age 30, and that process, called sarcopenia, accelerates around age 40. Lift weights and eat a protein-rich diet to preserve your muscle strength as you age.” —Dr. Apovian

It’s about progress, not perfectionAndrii Kobryn/Shutterstock”Attitude is everything. When shedding weight, progress is more important than perfection. Small steps lead to big changes. And, if you fall off the wagon, jump back on. Each day is a new day to eat and be well.” —Jared Koch, certified health coach and nutritional consultant, founder of

It’s not a diet, it’s a lifestylelzf/Shutterstock”I wish clients understood that losing weight is about more than the number on the scale. Following fad diets may promote quick weight loss but typically results are fleeting and may lead to even greater weight gain once you resume your usual eating patterns. To lose weight for good, you need to adopt an all-around lifestyle change that includes what you eat, how you prepare food, and how often you move your body.” (Start with these 25 simple tips to start exercising when you’re a beginner.) —Chanté Wiegand, ND, Naturopathic Doctor and Director of Education at The Synergy Company

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There is no perfect dietsaschanti17/Shutterstock”There is no one-size-fits-all weight loss diet for everyone. Ketogenic, Paleo, low fat, vegan—the options are numerous. But you must take into account the individual’s overall health concerns in the context of their weight loss strategy. What works for one person may make someone else ill or may simply not be effective.” Dr. Wiegand (If you’re on the Paleo diet, you’ll want to drop everything to try these Paleo smoothies.)

Diet is more important than exerciseSirikunkrittaphuk/Shutterstock”You cannot outrun a bad diet. So many clients think because they sweat it out in the gym they can eat whatever they want. While fitness is essential for heart health and functionality, it is important to note that 80 percent of weight loss is diet.” —Suzanne Fisher, MS, RD, LDN Registered Dietitian and Licensed Nutritionist

Stressing about losing weight makes it harder to lose weightSyda Productions/Shutterstock”Watch your stress level. Stress elevates the hormone cortisol, and when elevated, cortisol can interfere with memory, promote weight gain, and lower immune function. Cortisol can also induce overeating and cravings, usually for high-fat, high-sugar foods. In addition, ghrehlin, the hunger or appetite hormone, has been found to increase during times of extreme stress. Make sure you’re taking time to de-stress every day.” (If you must have snack, try these 11 healthy ways to de-stress with food.) —Fisher

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Snacks can cut cravingsElena Veselova/Shutterstock”Ghrelin, the hunger hormone, will increase during periods of hunger, so a mid-afternoon snack may prevent late-day overeating. Pack a snack or have some emergency rations stored in your desk to avoid temptations. I recommend nuts, seeds, fruit, yogurt, cheese sticks, air popped popcorn, and low sugar granola bars. Consuming a snack that contains protein will promote satiety and help to reduce cravings.” —Fisher (These are the on-the-go snacks nutritionists carry in their bags.)

Get your hormone levels checkedfarland2456/Shutterstock”If you’re trying everything and still not losing weight, I always recommend digging deeper into hormones. Imbalances in cortisol, thyroid and other stress hormones may be blocking success. Diet and exercise are often not enough.” —Wiegand (Check these signs you could have a hormone imbalance.)

Your microbiome is one key to weight lossAnatomy Insider/Shutterstock”Tweaking the gut microbiome—the balance of good bacteria in your digestive system—can help your body shed pounds. Certain healthy bacteria in the gut predispose you to a faster metabolism. You can actually sequence the gut microbiome and look for imbalances and then working on rebalancing.” (Eat these 7 probiotic foods to boost your healthy gut bacteria.) —Wiegand

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Weight loss is not a straight linealexkich/Shutterstock”Losing weight is not linear. Your body weight will fluctuate as you go through different phases, especially for women at certain times of the month. From a psychological point of view, if your body weight goes up for a few days in a row, do not panic. Look at the overall trends instead.” —Rob Jackson, Personal Trainer, founder of Minimal FiT

Don’t beat yourself up for eating a treatkikovic/Shutterstock”One treat will not ruin a pattern of successful clean eating. If you’ve been training hard in the gym, it might even be beneficial. Don’t beat yourself up over it, as this mindset can really knock you back. Instead, draw a line under the experience and continue with the clean eating that you were doing before the treat.” (Or whip up one of these 30 healthy treats that will satisfy your cravings sans guilt.) —Jackson

Weight loss is about the journey, not the destinationHalfpoint/Shutterstock”I wish people understood that weight loss and weight maintenance behaviors are two sides of the same coin. Too many people seem to want to shed pounds as quickly as possible without really trying to change their eating and lifestyle behaviors for the long term; they figure they’ll deal with the weight maintenance later on. When people say they are ‘going on’ a diet, it implies that—at some point—they’ll be ‘going off’ their diet. I always tell people that when you are changing your habits in order to lose weight, you’re just practicing for weight maintenance. I want them to focus on the behavior changes much more than their goal weight.” —Susan Bowerman, registered dietitian and director of Worldwide Nutrition Education and Training at Herbalife

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You absolutely must keep a food journalHave a nice day Photo/Shutterstock”I wish people understood the value of keeping really accurate food diaries. I encourage my patients to not only keep a diary, but to also write down ahead of time what they plan to eat and when they plan to exercise. This encourages them to stick to the plan. I also encourage people to use the diary as a tool to record their hunger level before and after eating, as well as their mood. The feedback from a well-kept food diary is invaluable. People learn if they are eating for emotional reasons rather than hunger, and they can also see how often they eat until they are more than comfortably full.” —Bowerman

Fix underlying emotional issues without foodSyda Productions/Shutterstock”When you manage your emotions rather than stuffing them down and following them with a food chaser, you save a whole bunch of calories. Figure out what’s really eating you, so to speak, and deal with that rather than depending on a sugar bomb to soothe your soul. When you face your issues, you no longer need to stuff your face. This gives you back the control you desire.” Renée Jones, counselor and author of What’s Really Eating You: Overcome the Triggers of Comfort Eating. These mind tricks will help you stop emotional eating.

Lack of sleep will make you eat more—a lot moreStokkete/Shutterstock”Research published in the European Journal of Nutrition shows that people consume more net calories the day after they don’t get enough sleep—about 385 more calories. With roughly 3,500 calories in a pound, an individual could theoretically gain a pound in 10 days of they’re not getting enough sleep.” (Got insomnia? Try these 13 secrets for better sleep, from sleep doctors.) —Joseph Ojile, MD, founder, CEO and medical director of the Clayton Sleep Institute and Chairman of the National Sleep Foundation

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Lack of sleep will also make you crave junk foodSyda Productions/Shutterstock”As if eating nearly 400 more calories a day wasn’t enough, research published in Sleep shows that sleep restriction amplifies and extends the blood levels of a chemical signal that ‘enhance the joy of eating, particularly the guilty pleasures gained from sweet or salty, high-fat snacks.’ This made people crave and eat more of these unhealthy snacks. Over time that can cause significant weight gain.” —Dr. Ojile. Use these science-backed tips to stop food cravings.

Cravings do affect some people more than othersVoyagerix/Shutterstock”Thanks to new research, we now know when people are most vulnerable to cravings (early evening) and which age groups crave more (young females crave more than older males, and younger female dieters crave more than older male dieters). Knowing your personal ‘risk factors’ can help you manage your cravings.” —Frank Greenway, MD, chief medical officer at the Pennington Biomedical Research Center in Baton Rouge, LA

Liposuction isn’t a weight loss shortcutSibFilm/Shutterstock”One of the biggest misconceptions about weight loss some of my patients have is the belief that cosmetic plastic surgery, especially liposuction, is a way to lose weight. Liposuction may remove up to a few pounds from the midsection during surgery, but it is a sculpturing tool, not a weight loss tool. If a patient is overweight, I actually ask them to lose weight by other means first before I will perform liposuction.” (On the other hand, these 40 simple tips will definitely help you lose weight.) —Joshua D. Zuckerman, MD, FACS, a New York City board-certified plastic surgeon

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You’re not fat just because you love foodDusan Petkovic/Shutterstock”Shedding pounds shouldn’t be your focus. Your main focus should be figuring out what caused the weight gain in the first place. Without knowing that, you’ll likely see the weight creep back on because the underlying issue hasn’t been solved. The issue(s) could be anything from hormone imbalances to cravings, but in most cases, it is solvable.” —Leah de Souza-Thomas, MPH, epidemiologist and founder of The Thrive Practice

You’re not a slave to your cravingsKseniia Perminova/Shutterstock”The average food craving lasts for about 15 minutes, so if you’re craving something that isn’t the best fit for you that day, distract yourself for 15 minutes. Chances are good that the craving will pass, and even if it doesn’t, you will likely have more insight into why you’re having that particular craving.” —Kelly Morrow Baez, PhD, licensed professional counselor and private weight loss coach

Eating fat will not make you fatFoodpictures/Shutterstock”Many clients come to me and are terrified of eating avocados, nuts, hummus, and other healthy fats as they claim that the foods are ‘too fattening and caloric.’ I explain that fat is digested slower than carbs and protein and will also help promote satiety. Full-fat dairy products, nuts, and plant-based fats promote weight loss, not inhibit it.” —Eliza Savage, MS, certified dietitian nutritionist at Middleberg Nutrition in NYC

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Allergy meds can cause weight gainpuhhha/Shutterstock”Some common over-the-counter medications can hurt weight loss. I advise people trying to lose weight to use antihistamines sparingly. Try spot-treating the symptoms instead. If you have nasal symptoms, consider only nasal sprays rather than a pill.” (If you have allergies, make sure you know the truth about these 11 common allergy myths.) —Chandler Park, MD, founder of at the University of Kentucky College of Medicine

Fast weight loss isn’t fat losslithian/Shutterstock”Fast weight loss, such as 10 pounds in two weeks, that results from extreme food restriction, juice cleanses, or cutting out carbohydrates completely is mostly due to loss of water weight and muscle mass, and can be very unhealthy. This weight loss is not sustainable and is usually regained back fast and results in a cycle of yo-yo dieting, which messes up your metabolism. The actual pounds you want to lose and keep off—pounds of fat—require a meal plan that includes all food groups and is not overly restrictive so that you can fuel your body to burn fat efficiently.” —Rachel Goodman, RD, CDN owner of Rachel Good Nutrition. Learn the truth about detox diets.

Your tech is making you overeatSyda Productions/Shutterstock”People have become completely disconnected from what satiety is and what it should feel like. We eat in the car, while working, while on our phones, or while watching television—we have become mechanical eaters. Mindful eating is a fundamental part of losing weight and keeping it off. You should eat when your body is asking you for fuel and stop eating when you your full. Keeping away from distractions can help learn this behavior.” —Gisela Bouvier, registered and licensed dietitian nutritionist

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Skipping meals doesn’t helpVita Sun/Shutterstock”I wish people would know that skipping meals, especially skipping breakfast, is not the answer. Many people think if they just cut calories by not eating certain meals they will lose weight, but it actually does not help them lose weight and instead sets them up to overeat later and/or to make unhealthy choices later.” —Rachel Goldman, PhD, clinical psychologist in NYC specializing in health and wellness and Assistant Clinical Professor of Psychiatry at NYU School of Medicine

You eat too fastDedMityay/Shutterstock”People need to slow down when they eat! Most people eat too fast and when we eat too fast, we overeat. By simply slowing down the meal—try putting your utensil down between bites, or eating with your non-dominant hand—your stomach and brain will have time to connect. When you slow down your eating, you will be able to eat less food and feel full faster.” (This is how you can eat more mindfully.) —Dr. Goldman

Starving yourself doesn’t workVGstockstudio/Shutterstock”You need to eat to lose weight. What I mean here is that you can’t skimp too much on calories to lose weight. Don’t think eating just a 200-calorie microwave dinner is a good thing. You’ll have better weight-loss results if you’re eating enough. If you eat too little, you could end up slowing your metabolism, which is not going to be helpful to weight loss.” —Amy Gorin, registered dietitian nutritionist and owner of Amy Gorin Nutrition in Jersey City, NJ. Don’t fall for these other metabolism myths that could be sabotaging your weight loss.

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Fiber is a dieter’s best friendBrian A Jackson/Shutterstock”Having a diet high in fiber is an incredible way to lose weight. Fiber helps keeps you fuller longer, which can help control weight. It also keeps your digestive system regular, preventing constipation. The average woman requires 25 grams, and the average man requires 38 grams of fiber per day—but most Americans do not get even half that. (Psst: Here are 30 ways to get more fiber in your diet without even trying.) When adding fiber to your diet, it is very important to drink water throughout the day to prevent bloating. It is also encouraged to eat protein with fiber, which promotes satiety.” —Brooke Zigler, registered dietitian

Start reading nutrition labelsNestor Rizhniak/Shutterstock”Pay attention to nutrition labels. Focus on the ingredients, not the numbers. Make sure you’re eating good, clean food. Even better, choose foods that don’t need a label, like fresh vegetables, fruits, nuts, seeds, and healthy fats. Look for organic, grass-fed, pasture-raised, and humane meats.” —Tanuja Paruchuri, Certified Holistic Health Coach in New York

Sugar is the worstHandmade Pictures/Shutterstock”The main ingredient you need to watch out for is sugar. Remember that sugar wears lots of disguises—there are more than 61 names for sugar on food packaging these days. Some common monikers include evaporated cane juice, fructose, high fructose corn syrup, corn syrup, sucrose, dextrose, maltodextrin, and more. Sugar, particularly hidden sugar, is responsible for weight gain and health issues in most people.” —Paruchuri

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You can’t do this alonend3000/Shutterstock”It is nearly impossible to shed weight all on your own. Most people need a supportive community, coach, therapist, accountability partner, and/or group to stay on track.” (Or try one of these 13 insanely motivational quotes to help you lose weight.) —Sandee S. Nebel, Licensed Mental Health Counselor and Certified Eating Disorder Specialist, owner of White Picket Fence Counseling Center

Fail to plan, plan to failfizkes/Shutterstock”Structure is so important to reaching and maintaining a healthy weight. For instance, I recommend using a template food plan, scheduling time for movement, preparing food in advance, and seeing a therapist to help with the emotional side, particularly body image issues.” —Nebel

Weigh every daytmcphotos/Shutterstock”Weigh yourself every day and keep a food tracking journal. These will help you be more accountable. If you know you’re going to have to write it all down and weigh yourself, you may be less apt to eat that extra helping or have that chocolate cake after dinner.” (Bonus: Science has revealed the best time of day to weigh yourself.) —Nicole Palacios, certified personal trainer, weight loss specialist, and registered kinesiologist

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The more you talk, the more you losePressmaster/Shutterstock”Tell everyone you know about your weight loss goals. The more public it is, the more you’re likely to stick with it, because people are going to ask you how it’s going and what you’re doing. Tell your coworkers, your spouse, your friends—they can also help you be more accountable and maybe won’t offer you all the treats at the next party if they know you’re trying to lose weight.” —Nicole Palacios

It’s easier not to eat something than it is to burn it off latergolf bress/Shutterstock”I wish my clients truly understood how quickly you can consume calories and how slowly your body burns them off with exercise. That can of soda you just had with lunch? It took you a few minutes to drink it, but it’ll take you an hour on the treadmill at moderate to high intensity to burn it off. That little snack-size chocolate bar? Another hour on the treadmill. That old saying, ‘a minute on the lips, a lifetime on the hips’, couldn’t be truer.” —Eamonn Leaver, PhD, organizational psychologist, sport and exercise scientist, and author of The Home Fit Freak

Portion control is everythingOleksandra Naumenko/Shutterstock”Many of my clients are eating foods that are absolutely fine for them. The reason they’re either gaining weight or not losing weight is simply because they’re eating too much of it. I recommend swapping your regular sized dinner plate for a smaller plate. (Or try these other simple tips and tricks for portion control.) Portion control is so underrated in weight loss.” —Leaver

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Weight loss is about the future, not the pastMita Stock Images/Shutterstock”I recommend that clients visualize how they are going to feel when their goals are achieved. Imagine the day, where you are, how your body feels, how good you feel to be healthier, what the air smells like, etc. Spending a few minutes each day putting yourself in your own shoes and connecting to that sense of accomplishment can be very motivating, and a great mental strategy to use during the tougher times when you are tempted to break your lifestyle change commitments.” (If you’re worried about willpower, try this one science-backed tip guaranteed to motivate you. —Kris Boksman, PhD, Clinical Psychologist, Owner and Director of Limestone Clinic

Deprivation leads to bingeingYuriy Maksymiv/Shutterstock”A very important thing that can sometimes really mess up someone adopting a new diet-related lifestyle is a sense of deprivation. Deprivation can be physical and psychological. If you have a physical craving and are also feeling psychologically deprived, you’re much more likely to cheat. The more deprived you feel, the more likely a food binge will result. Allowing yourself a ‘cheat day’ or to eat desserts or some other kind of treat a few times a week, in sensible moderation, can keep massive slip-ups from happening.” —Boksman

Your chair is your worst enemyJacob Lund/Shutterstock”People simply need to stand more during the day. We often have time when we are idle or resting and spend that time sitting while watching TV, playing on our phones, or even working. But simply standing to do these things burns twice the calories.” —Jeremy Kring, MS, exercise scientist

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Eat more plants. Seriously.Brent Hofacker/Shutterstock”One of the easiest and most cost-effective ways to lose weight for the long term is to build your meals around plants, aiming for eight or more servings per day. Plant fibers will keep you satiated and also build a healthy gut by creating more diversity in your microbiome, which can play a huge role in weight loss. You can select any plant, from raw Brussels sprouts served with Pecorino Romano cheese and olive oil, to sautéed mushrooms and zucchini. The goal is to have plant foods—in excess—raw, steamed, or lightly cooked.” (For more ideas, try these 14 simple vegetarian dinners.) —Stella Metsovas, author of Wild Mediterranean

No one ever hated themselves thinGaudiLab/Shutterstock”You can’t hate your way through weight loss. It’s easy to get fixated on a number on the scale and rest your happiness on that number, hating your body during the entire journey. Positive thinking and self love have a big part in improving your health, so love the body that you’re changing and be gentle on yourself. (Need help loving yourself? Just one workout boosts your body image.) The process of losing weight will teach you a lot about yourself. Don’t miss out on that lesson by focusing on only one goal.” —Maya Rams Murthy, MPH, RD, Founder and CEO of Eat with Maya

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