Can Dieting Part-time Help You Lose Weight?

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Among the many strategies for losing weight and aging well - following a low-carb diet, eliminating gluten, getting more exercise - there's one that's consistently recommended by researchers: calorie restriction. When you take in fewer calories than you require to maintain your current body weight, you'll lose weight.
The big challenge is how to sustain the calorie deficit long enough to see significant results.
A relatively new strategy called intermittent fasting may offer a manageable way of eating less because you're only required to diet some of the time. Fans say it's a plan that you can stick with over months, even years.
  • Read more: How obesity can affect your liver

What is intermittent fasting?  

Intermittent fasting means severely restricting your food intake on one, two or more days of the week and eating normally the rest of the time. The so-called "fast days" aren't total fasts; rather, you take in about a quarter of your normal calories. For women, that represents about 500 calories, for men, about 600 calories. It's often referred to as a 5:2 diet, with five normal days and two fasting days; other versions are called 4:3, 6:1, alternate-day fasting (ADF), or the "every-other-day" diet plan.
A 2012 BBC documentary, Eat, Fast and Live Longer, is often credited with bringing intermittent fasting into the mainstream, but it's been researched longer than that for its potential benefit in reducing breast cancer, heart disease, diabetes and cognitive decline.
In fact, calorie restriction for longevity has been researched since the 1930s and is so far the only method proven to improve longevity, at least in lab animals.
  • Read more: The CALERIE study: examining calorie restriction on aging and longevity

What Does the Research Say?

Several studies have suggested that intermittent fasting works as well as continuous calorie restriction for weight loss, but there's still little evidence on the long-term effectiveness of the diet.
Researchers note that effective diets are satiating, provide for your nutritional needs and be easy to follow. Since intermittent fasting doesn't require a total overhaul of your diet, simply a restriction of calories on some days of the week, it may be successful dieting method. Long-term studies are needed, however, to show the safety and success of intermittent fasting.

Does it Lead to Bingeing on Other Days?

Perhaps surprisingly, this doesn't seem to be the case. In one study, subjects who ate 20-30% of their normal calorie requirements on fasting days generally ate just 10% more than usual on their non-dieting days. In addition, many people reported that their feelings of hunger on low-calorie days dramatically diminished over time.

A Better Kind of Weight Loss

Another promising finding is that intermittent fasting appears to yield the loss of less lean muscle when compared to conventional daily dieting. In a 2011 review, 90% of the weight lost through intermittent fasting was fat; compared with only 75% in daily dieting.
Maintaining lean muscle mass while dieting offers a metabolic advantage for maintaining the weight loss, because muscle burns more energy than fat even at rest.

Does it Reduce Belly Fat?

Belly fat, aka visceral fat, is the spare tire that surrounds your internal organs, leading to a greater risk of diabetes and heart disease. A 2011 review found that both traditional dieting and intermittent fasting reduce similar amounts of belly fat.

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