WTH?! Why Am I Gaining Weight With Intermittent Fasting?

WTH?! Why Am I Gaining Weight With Intermittent Fasting?

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Many people find that intermittent fasting (IF) comes with a variety of health benefits, including disease prevention, improved digestion, and even reduced bloating. But for many people, the reason they dabble in timed meals and eating windows is for weight loss. If you are in the latter category, and you've been on the IF train for months and have actually gained weight, we might have some answers. We've asked experts to weigh in (no pun intended!), and these are the six intermittent fasting mistakes that can lead to weight gain.

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"Intermittent fasting doesn't guarantee weight loss. Some studies have shown it can be beneficial for weight loss/management but not if you're eating excessive amounts of food during your eating window," registered dietitian nutritionist and NASM-certified trainer Whitney English Tabaie, MS, RDN, CPT, told POPSUGAR.

If you're eating from the minute your window opens to the very last second that your window closes (just one more handful of popcorn!), and you're not tracking your calories, there's a good chance that you're overeating.

Intermittent fasting works because limiting your eating window is a means of calorie restriction and eating fewer calories than you burn helps with weight loss.

Tabaie added that fasting isn't for everyone. She explained that for some people, restricting eating hours "can lead to binge eating, which would be counterproductive to weight-loss attempts. This is why I recommend intermittent fasting for potential health benefits and not as a weight-loss strategy."

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Ensure that you're eating enough calories during your window. If you don't, registered dietitian Leslie Langevin, MS, and author of The Anti-Inflammatory Kitchen Cookbook, explains that it can cause "the binge and starve cycle." If you don't eat enough on Monday and then on Tuesday you end up binging, and if this cycle continues, it can lead to weight gain. Being too hungry can totally disrupt your IF windows too (you don't want to dip under 1,200 calories daily). If you do, then intermittent fasting isn't to blame for your weight gain — it's just the fact that you're not eating enough and then eating too much. In this case, intermittent fasting might not be for you.

If you are caught in this cycle, Langevin suggests reducing your fasting window to maybe 12 or 14 hours. "This can still be helpful and reduce the time of eating in the day so the body is in calorie-burning mode more of the time, but still provides a longer window of eating."

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One of the bonuses about the intermittent fasting lifestyle is that no food is off limits. While you can eat high-carb foods like pasta, pizza, bread, and fruit smoothies, you want to make sure that you're eating enough protein to prevent hunger. If you don't, you'll end up feeling hungry, which can result in you eating more.

Leslie Langevin says, "The basic idea is that IF is a tool, but if you're not paying attention to calorie intake, or a balanced intake during your eating window, that can backfire," and result in weight gain.

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Eating sugary foods and refined carbs like pasta, bread, sweeteners, and dessert don't cause weight gain just because they tend to be high in calories — these foods affect your insulin levels. Jason Fung, MD, a nephrologist (kidney specialist) and author of The Complete Guide to Fasting, explained to POPSUGAR that these foods spike your insulin levels. When insulin levels are high, it signals your body to store fat, which can lead to weight gain.

Eating these types of foods can also make you eat more in general, explained Susan Peirce Thompson, a psychology professor with a Ph.D. in brain and cognitive sciences. When eating sugar elevates insulin levels, it blocks leptin (the hormone that signals to your body that you're full). If your brain doesn't get the message that it's had enough, it'll signal to your body to keep eating.

Eating sugary foods also makes you want them more. That's because sugar overloads your dopamine receptors, leading to strong and insatiable cravings. In Thompson's book Bright Line Eating, she explained that this is why you eat cookie after cookie and still want more.

You don't need to ditch all carbs, though. Opt for complex carbs like whole grains, beans, veggies, and fruits. Langevin said to aim for three servings a day of whole grains, one to two of fruit, and one to two of legumes. Here's a list of the best carbs for weight loss.

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While fueling after a workout is important, just because you go for a 30-minute run AND you do intermittent fasting, it doesn't mean you can eat whatever you want. How much you eat still matters. Depending on your weight and the pace of your run, that half-hour run only burned between 200 and 400 calories. So you can't go overboard and inhale 5,000 calories during your eating window and still expect to lose weight.

Langevin adds to utilize mindful eating. "Eat when you are truly hungry, and make sure to stop eating when you're full."

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There are several intermittent fasting methods, and some are more strict than others. This could leave "someone famished, leading to overeating later on," registered dietitian Rachel Stahl, MS, RD, CDN, CDE, explained.

The 20:4 method, where you only have a four-hour eating window every day, may leave you feeling ravenous once your eating window opens, so you end up eating more calories than if you weren't doing IF at all.

Your IF lifestyle should feel easy and effortless, and definitely shouldn't leave you feeling so starving that you binge. Try different methods to see if they work better for you, or consider that IF might not be for you.

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