Why People Diet, Lose Weight and Gain It All Back

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

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.

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.

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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.

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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.

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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.