Really, it shouldn’t be so difficult to figure out which eating regimen will set fire to fat while maintaining muscle. Fortunately, the International Society of Sports Nutrition just released its position paper, which combs through all existing scientific studies to report how every diet will affect your body composition. Here, we’ve pulled five of the most six-pack-friendly diets and streamlined how they’re great, as well as why they might be right (or wrong) for you—according to the hard science.

Sometimes, you might need an external motivator—like a race or a competition—to keep you on track. After a slow start to her slimdown, Maribel Contreras decided to sign up for a 12-week body transformation contest at her gym. She swapped out her fast-food trips for healthy homemade meals and revved up her workouts, which ultimately helped her win the competition. She now maintains a 77-pounds-lighter frame. 
During feeding, you store food energy as body fat. During fasting, you burn body fat for energy. If you balance those two, your weight will remain stable. If you are predominantly feeding, you will gain weight. If you are predominantly fasting, you will lose weight. So, here’s my best single tip for weight loss. It’s so simple and obvious that even a 5-year old could have come up with it.

“Diet and exercise are a marriage that should never divorce,” said Giancoli, noting that the benefits of exercise aren’t restricted to the sheer number of calories you burn during thirty minutes on a treadmill. (Need one of those, by the way? We have some favorites.) Instead, research shows that muscle tissue burns more calories than fat tissue, proving that “muscle mass is a key factor in weight loss.”
I have lost about 23 lbs so far with very little effort and have kept the weight off ever since. Since I began the HCG diet I've witnessed a considerable amount of weight loss and a loss of inches in a very short time frame. I'd had mornings when I thought my scale was broken. I kept dropping around 1-2 lbs every day. There were never any side effects. This has given me a taste of success, and I don't ever want to go back to my former weight.
Burning body and belly fat with cardio exercises is half the battle. Next is strengthening abdominal muscles so you have something to show once the fat is shed. In a recent study, ab exercises were ranked from best to worst. The bicycle exercise ranked as #1 because it requires abdominal stabilization, body rotation, and more abdominal muscle activity.
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Over the last three months I’ve lost 22 pounds simply by upping my exercise and reducing bad calories. I’m 68 years old, always in good shape, but added sedentary pounds as I aged. (6 feet tall, 212 pounds before — 190 pounds now) I’ve generally restricted my diet to about 1200 calories a day — 200 – 300 for breakfast, 200 for lunch, and about 700 or less for the rest of the day. I try to vary the foods, do as much exercise as I can (biking, swimming, walking, weights). I drink as much non-caloric liquid as I can and I try to find food that fills me up — vegetables, fruits, mostly. I eat some cheese and a good hamburger occasionally, although I avoid most meat. I still work full time. I realize the discipline necessary, but it’s not that hard to do. I rely on a good scale and moderate my diet each day to keep a constant weight. My blood pressure has dropped from 130/80 to 117/72 and heart rate is resting 58. I’m lucky that my chronic diseases are not yet serious (osteoarthritis and borderline cholesterol, although I dont take statins because of reactions). I’m not a diet fadder, but using common sense goes a long way. Eat smart and work out. MM
"These diets are so restrictive that of course you're going to lose weight fast because you're not eating enough calories to sustain basic activities of your body, let alone any exercise. That's nothing that any person can sustain for the long term," Hogan said. "The weight's going to come back if you do lose any weight, and then it's going to be harder to lose weight in the future."
Low-calorie diets: It is harmful to reduce your daily calorie intake lower than 1400 calories per day, because your body adjusts to a semi-starvation state and looks for alternative sources of energy. In addition to burning fat, your body will eventually burn muscle tissue. Because your heart is a muscle, prolonged starvation will weaken it and interfere with its normal rhythms. Low-calorie diets don't meet the body's nutrition needs, and without nutrients your body cannot function normally.
Remember that it takes a 3500-calorie deficit to lose one pound of fat. That is, you have to either burn off 3500 calories through exercise or eat 3500 calories less than you burn in a week. Break this up into daily limits. To burn 3500 calories a week, you should aim to have a 500 calorie deficit every day. For example, you can exercise to burn 250 calories and cut 250 calories from your diet.
Cruciferous veggies are one of the healthiest vegetables you can eat, but unfortunately they’re also the ones most likely to cause your tummy to inflate. Thanks to raffinose, a compound that produces extra gas as it breaks down, broccoli, cabbage, cauliflower and the like can seriously increase your waistline. But don’t ditch them forever. Just save them for meals where you can wear loose pants. Here are other surprising foods that cause gas.

Ease into running. You might get discouraged if you attempt a jog without building up that type of strength—and this could put a damper on your motivation. "I started walking, and before long, I was running," says Cipriana Cuevas, who lost 60 pounds and eventually completed a half marathon. "Getting lighter made running easier, and, in turn, more fun."
DASH stands for "dietary approach to stop hypertension" and was created by the National Institutes of Health (NIH) as a way to help reverse national trends of obesity and heart disease. Scientists combed through decades of research to come up with an expert-backed list of diet tips, along with a prescription for exercise. And it worked: The DASH diet has topped nearly every diet list for nearly a decade. Doctors particularly recommend it for people looking to lower high blood pressure, reverse diabetes, and lower their risk of heart disease. (Here's the basic list of DASH diet-approved foods.)
In your body, nothing happens by accident. Every single physiologic process is a tight orchestration of hormonal signals. Whether our heart beats faster or slower is tightly controlled by hormones. Whether we urinate a lot or a little is tightly controlled by hormones. Whether the calories we eat are burned as energy or stored as body fat is also tightly controlled by hormones. So, the main problem of obesity is not the calories we eat, but how they are spent. And the main hormone we need to know about is insulin.

Remember that it takes a 3500-calorie deficit to lose one pound of fat. That is, you have to either burn off 3500 calories through exercise or eat 3500 calories less than you burn in a week. Break this up into daily limits. To burn 3500 calories a week, you should aim to have a 500 calorie deficit every day. For example, you can exercise to burn 250 calories and cut 250 calories from your diet.
It's not just what you eat that can make you pack on pounds—it's also how much. Before dropping 102 pounds, DeGennaro did not have a grip on proper serving sizes. "Sitting down to dinner with my husband and three kids, I'd scarf down mounds of pasta and endless rolls," she says. "Adjusting to smaller portions was tricky at first; I'd round out meals with extra veggies to keep from getting hungry."

I love this study because it examined a realistic lifestyle change rather than just a fad diet. Both groups, after all, were labeled as healthy diets, and they were, because study investigators encouraged eating high-quality, nutritious whole foods, unlimited vegetables, and avoiding flours, sugars, bad fats, and processed foods. Everyone was encouraged to be physically active at a level most Americans are not. And — this is a big one — everyone had access to basic behavioral counseling aimed at reducing emotional eating.
"Protein is great for fat loss. It helps build and preserve lean muscle tissue and can increase the amount of calories you burn. It’s also a great source of energy that helps you feel fuller for longer, so you’re less tempted to snack. Good sources include chicken breast, tuna, eggs, milk and chickpeas. And if you’re finding it difficult to avoid snacks that are high in carbohydrates, try substituting them for protein shakes or bars. Remember also to opt for the lean sources of protein because some sources can be high in saturated fat."
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