September 30, 2019

Why People Diet, Lose Weight and Gain It All Back

Plus 4 ways to break the cycle + maintain your weight loss

Scale on seesaw going up and down

You — and your diet — have been firing on all cylinders. The weight is melting off, and you’re feeling your best. But then there is that seemingly inevitable backslide, with pound after pound creeping back on despite your best efforts. It’s the ultimate Catch-22.


Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services. Policy

But before you beat yourself up, endocrinologist and obesity specialist Marcio Griebeler, MD, has some welcome news: It’s most likely not your fault.

“Your body is fighting to keep your weight as it was before the dieting,” he says. But take heart — it’s possible to win the battle.

What “weight set point” has to do with it

Experts think as many as 80 to 95% of dieters gain back the weight they’ve worked so hard to lose. Why? (WHY?!?)

Dr. Griebeler says the culprit is your “weight set point”: the weight your body is programmed to be. Your weight set point is a combination of several factors, including your:

  • Genetics.
  • Hormones.
  • Behavior.
  • Environment.

Weight set point and metabolism play for the same team: Your metabolism burns energy at a rate that will maintain your weight set point, even if that point is heavier than is healthy.

“Most of the time, weight gain is gradual, and that can raise your set point gradually, too,” notes Dr. Griebeler. “But certain lifestyle changes can lower it.”

The perils of yo-yo dieting

Beware of the quick-fix, Dr. Griebeler warns. “A fad diet won’t change your set point. It’s just restricting calories,” he says. “Your body is very efficient. You can successfully lose weight for a while, but at some point, your body simply adjusts to need fewer calories to function.”


Which means weight loss will eventually stop, unless you start eating even less than your diet calls for. (You can see where this is going.)

Your body is also a survivor. As soon as calories drop, it starts doing everything in its power to prevent starvation, including:

  • Ups the hunger hormone: Levels of the satiety hormone leptin (which controls how full you feel) decrease. Meanwhile, levels of the hunger hormone ghrelin increase. You feel hungrier, even after eating a normal meal.
  • Makes you think, “Oooh that looks good”: Eating fewer calories alters how you think about and perceive food. Research shows dieters become hyper-focused on food and that it even smells and tastes better to them.

These effects stick around for the long-term. Remember the television show The Biggest Loser? Contestants still felt the effects of their calorie deprivation six years later, making it harder to keep the weight off.

“Research tells us that yo-yo dieting can negatively affect your metabolism,” Dr. Griebeler says. “It doesn’t matter the diet: low-carb, low-fat, ketogenic, whatever. We see rebound weight gain almost every time.”

How to lose weight without gaining it back

To maintain weight loss for good, Dr. Griebeler advises focusing on these four areas:

Diet. How can you create a healthy, long-term, stick-with-it diet?

  • Learn what’s healthy — and what’s not. (A nutritionist or dietitian can help.)
  • Practice portion control, even when eating healthy foods.
  • Avoid empty calories, but treat yourself once in a while.
  • Don’t “diet.” Instead, focus on forming healthy habits for life.

Exercise. Be an equal opportunity exerciser: Do both aerobic exercise (three to five times a week) and resistance training (two to three times nonconsecutively each week). Shoot for at least 25 to 35 minutes on most days.

Exercise works best for staving off weight gain (not jumpstarting weight loss), so recognize that binging on exercise can be just as bad as binging on food. “Exercise can make people super hungry, while it makes others tired and inactive, which can negate the activity they did,” Dr. Griebeler explains.

But it’s also important to remember the cardiovascular benefits of exercise, independent of weight loss. “Exercise is always good and important,” he says.

Stress. Stress not only causes some people to eat more, but it also raises levels of the stress hormone cortisol. “If you have more cortisol, you end up with higher insulin and lower blood sugar levels,” Dr. Griebeler says. (Cue the cravings.) To cope, put down the fork and try meditating or talking to a trusted friend.

Sleep. Not getting enough sleep raises cortisol levels, too. It also affects decision-making (read: your ability to stick to healthy habits). Seven to nine hours every night is the magic number you need to help you manage stress. It also helps your body work with you — and not against you — when it comes to weight loss.

Related Articles

Female speaking with doctor, with uterus and ovary with cysts
February 21, 2024
Can PCOS Cause Weight Gain?

The common hormonal condition is linked to insulin resistance, which can cause weight gain

Elder woman performs a plank on a green mat on the floor while in an online exercise class.
July 2, 2023
Menopause Weight Gain Is Normal — Here’s How To Combat It

Losing menopause weight may take more effort, but it’s doable

Graphic of uternie fibroid tumers placed anotomically in a silhouette of a body
June 18, 2023
Do Uterine Fibroids Make You Gain Weight?

Depending on their size, these noncancerous growths can create an abdominal bulge

2 glasses of diet sodas with ice
May 18, 2023
Sad but True: Diet Sodas Are Bad for Your Health

Diet sodas are associated with weight gain, and may even cause insulin confusion

Woman driving and eating a hamburger
February 28, 2023
You Guessed It: Long-Term Stress Can Make You Gain Weight

Stress hormones trigger cravings in an attempt to keep us safe from danger

Person dropping sliced bananas into a cup to make a smoothie, with other foods in the background
June 21, 2022
How to Gain Weight Safely

Sometimes, gaining weight is a health necessity

Hand holding a glass of wine atop a wooden counter, with wine and bread in background
July 29, 2021
Wine and Your Waistline: Why You Aren’t Losing Weight

Find out if liquid calories are crashing your party and your diet

eating healthy over the holidays
December 9, 2020
Tips for Eating Healthy During the Holidays

Advice for smart holiday eating, while still enjoying yourself

Trending Topics

White bowls full of pumpkin seeds, dark chocolate and various kinds of nuts
25 Magnesium-Rich Foods You Should Be Eating

A healthy diet can easily meet your body’s important demands for magnesium

Woman feeling for heart rate in neck on run outside, smartwatch and earbuds
Heart Rate Zones Explained

A super high heart rate means you’re burning more than fat

Spoonful of farro salad with tomato
What To Eat If You’ve Been Diagnosed With Prediabetes

Type 2 diabetes isn’t inevitable with these dietary changes