How does it work? The Shred Plan is based on “diet confusion.” This principle is modeled after a similar strategy in exercise called muscle confusion, which is used to help break through plateaus of muscle growth. When you do the same types of exercises at the same times, your muscles acclimate to the stress and your progress stagnates. Muscle confusion dictates that people work their muscles in different ways for varying durations of time. By “confusing” your muscles, you can trigger their sustained growth and continue to move toward your fitness goals.
One, it's impossible to "spot reduce." While you can target certain areas of your body in terms of building up the muscles in that area, you can't decide to just lose weight in your stomach, or your thighs, or your rear. It doesn't work that way. You can't remove subcutaneous body fat from specific areas of the body by doing exercises that target those areas. Doing hundreds of crunches will certainly strengthen your abs, but that won't reduce the amount of fat stored in your torso.
Real talk: It could take weeks or months to see the metabolic effects of exercise on the scale, and even then, building muscle, which is denser than body fat, could lead to weight gain. "Do what you like because it’s good for you," Dr. Seltzer says, noting the way exercise is awesome for your heart, mental health, and more—and that not all measure of progress can be seen on the scale.

There’s a reason why protein takes center stage in many popular diet plans: it helps you feel full and stokes your metabolism enough to help you avoid the typical one or two pounds most adults gain each year. Your body burns slightly more calories after eating protein compared with fats or carbs, and protein from food also helps keep your muscles from deteriorating as you age. (Strength-building exercise is another important part of this process.) In order to get these benefits, you need to include protein at each meal, and getting adequate amounts of protein at breakfast — about 20 grams — is especially important. Making a beeline for the bagels or cereal means your body misses a key opportunity to rebuild muscle tissue, which naturally breaks down as you sleep. If this is your morning routine, your muscle mass will start to decline, and that means your metabolism will slow down. So skip the AM pastries and other carb-rich fare, and opt for an omelet or smoothie made with Greek yogurt or protein powder, instead.
In a way, moderate-intensity physical activity is that "magic pill" a lot of people are looking for, because the health benefits go beyond keeping your waistline trim: Not only can it reduce your risk of cancer, stroke, diabetes and heart attacks, but studies have shown that physical activity can significantly improve the moods of patients with major depressive disorders.
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