5 Weight-Loss ‘Rules’ Doctors Want You to Stop Following

Skimping on sleep in order to squeeze in a morning workout may be doing your weight-loss efforts more harm than good.

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With so much advice out there on the best ways to lose weight, it can be hard to separate diet fact from fiction. Unfortunately, many of the so-called “rules” of weight loss are at best ineffective — at worst, they might actually make you ​gain​ weight.

Here, doctors who specialize in weight loss to explain the tactics you should ignore and the ones worth paying attention to.

1. ‘You Are What You Eat’

If you’re only worrying abut what you eat, you aren’t seeing the whole picture.

“Diet is only one of the components of weight management,” says Marcio Griebeler MD, director of the Obesity and Medical Weight Loss Center at the Cleveland Clinic’s Endocrinology & Metabolism Institute.​It’s much more than that. Don’t just focus on a diet, focus on a healthy lifestyle.”

Dr. Griebeler uses a holistic approach for his patients that includes nutrition but also addresses appetite control, the psychology behind eating behaviors, exercise, stress and sleep (more on that in a minute). All of these factors can contribute to weight gain and prevent weight loss.

Take stress, for example. When you’re chronically stressed out, your body produces a lot of the hormone cortisol, which can rev up your hunger and negatively affect your metabolism, per a November 2015 study in ​Sleep Science​.

That’s why part of your weight-loss plan should include a goal to lower your stress levels. Journaling, dancing and deep breathing are just a few simple daily habits that can help.

2. ‘You Should Skip Sleep to Work Out’

Regular exercise is important for weight loss and good health, but it’s sometimes hard to fit it in. While it may be tempting to set the alarm clock an hour earlier to get your workout done, this approach could backfire.

Sleep deprivation stops your body burning calories so efficiently and can also make you eat more,” Craig Primack MD, president of the Obesity Medicine Association and co-founder of Scottsdale Weight Loss Centers in Arizona, tells LIVESTRONG.com.

When you don’t sleep well, your levels of the appetite-suppressing hormone leptin go down, while your levels of the hormone ghrelin — which makes you feel hungry — go up, Dr. Primack explains. (Hello, cravings!)

Shorting yourself on sleep (meaning: getting fewer than seven hours a night) could also undermine your exercise efforts. When you restrict calories and sleep at the same time, your body loses more lean muscle than fat, according to an October 2010 study in the ​Annals of Internal Medicine​. And less muscle means a slower metabolism (the rate at which your body burns calories), per the Mayo Clinic.

“Is it better to wake up early and exercise or get that seventh hour of sleep?” says Dr Primack. “I think it’s better to spend that hour of sleep.”

With that said, exercise is essential for a healthy lifestyle. Adults should aim for at least 150 minutes of moderate cardio a week, per the Centers for Disease Control and Prevention. So, ideally, you’ll want to squeeze in a half hour most days. But maybe that means going for a walk after dinner instead of watching TV, or going to bed earlier so you can get up for that morning jog.

3. ‘All Calories Are Created Equal’

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Losing weight isn’t just about reducing calories, but eating the right type of calories.

“One of the most common misconceptions is that a calorie is just a calorie, so it doesn’t matter what we eat — only how many calories we eat,” Michael Greger MD, nutrition expert and author of How Not to Diet, tells LIVESTRONG.com. “The notion that a calorie from one source is just as fattening as a calorie from any other source is a trope broadcast by the food industry as a way to absolve itself of culpability.”

In other words, 100 calories from a banana is not the same as 100 calories from a brownie. For one, the banana calories come with a host of good-for-you nutrients, including fiber, which helps you feel fuller longer, and B vitamins, which support a healthy metabolism.

Plus, processed foods like packaged snacks and desserts, sugary drinks and processed meat have been linked to weight gain. A December 2017 analysis in ​Current Obesity Reports​ found that eating more processed foods ups your risk for obesity and metabolic syndrome as well as high blood pressure and cholesterol.

According to the 2020-2025 Dietary Guidelines for Americans, a healthy diet limits added sugars, saturated fat, sodium and alcoholic beverages and contains a variety of fruits, vegetables, whole grains and lean proteins.

4. ‘Your Body Needs to Be Cleansed’

You don’t need to do a juice cleanse or “detox” to lose weight — or to reach any health goal, for that matter. Your body is very good at processing toxins and getting rid of waste, Dr. Primack says.

What’s more: While a cleanse may lead to weight loss, it’s only because you’ve flushed all the food out of your GI tract, not because you’ve actually lost body fat.

“You lose weight, but you are not changing anything in your metabolism,” Dr Griebeler says. And it’s only temporary: “At some point you will eat again,” he says, and the number on the scale will creep back up.

“Our main goal when we talk about weight management is actually to avoid being hungry. If you skip meals, you’re going to be hungry, and that’s not a good situation.”

5. ‘Skipping Meals and Snacks Cuts Calories’

Although it might seem counterintuitive, cutting out snacks and skipping meals may actually prevent weight loss. The reason? The lack of self-control you have when you are “hangry.”

In other words, skipping meals and snacks increases the likelihood that you’ll overeat later in the day, Dr. Griebeler says.

“Our main goal when we talk about weight management is actually to avoid being hungry,” he says. “If you eat healthily, you won’t be hungry. If you skip meals, you’re going to be hungry, and that’s not a good situation. You then don’t make the right choices.”

A much-cited July 2003 study in the American Journal of Epidemiology looked at the association between eating patterns and obesity and found that eating four or more times a day was inversely correlated with obesity — the more frequently participants ate, the less likely they were to have overweight. Those who skipped breakfast were more likely to have obesity.

This may be surprising if you’ve heard that intermittent fasting helps with weight loss, but here’s the deal: If you’re still eating the same amount of calories but just in a shorter time period, you aren’t going to lose weight. The only way to lose weight — via intermittent fasting or otherwise — is to eat fewer calories overall.


Plan out your meals and snacks in advance. If you know what you’re going to be eating, you’re less likely to make a bad choice and eat too many calories.

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