Why does this popular plan work? For one thing, it pushes wildly healthy staples to the forefront (think: nuts, vegetables, fruit, olive oil). For another, it's simply delicious, thanks to it's focus on fresh, simply prepared dishes like grilled fish with lemon and whole wheat pita with hummus. Science agrees: One meta-review of 16 studies, found the eating M.O. helped those on it lose an average of 8.5 pounds.

I also think its important to note that having portion control is not the same thing as being on a diet. I never considered myself to be on a "diet." I remember a few co-workers asking me what kind of diet I was on and I didn't know how to answer because I never thought of myself of dieting because I still ate all foods that I loved. It was more just eating all foods in moderation. I could still eat a good burger and sweet potato fries if I went out to dinner, drank wine on special occasions, ate dark chocolate and ice cream, etc. I never stopped eating the foods I enjoyed, I just ate them less. 
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.
i am 39 years old and have a good 35 lbs to lose. like you i ate whatever i wanted as a teen and stayed very thin (and i did literally no exercise) but then i hit 21 or so and realized i needed to cut back on calories and jog as weight slowly came on. then at 28-30 i got back to my teenage weight of 114 by jogging and watching carbs, i got married at 34 and since then pounds have just crept on for both my hubby and myself… i have tried everything :/
Electrolytes play a major role in keeping us alive since they provide the electrical current that allows our muscles, particularly the heart, to contract at the right speed. When there is a sudden decrease of food intake, there is also a sudden decrease in the electrolytes that our bodies are used to getting, particularly potassium and magnesium. If the body can’t handle the deficit, this can lead to impaired cardiovascular function and irregularities such as heart arrhythmias.
Everyone is different. How quickly you burn calories when you are not physically active can be very different from other people based on your specific genes, biology, and past. While scientists know that there are 3,500 calories in one pound, simply eating 500 fewer calories every day for a week (or 3,500 fewer calories in a week) does not always end in losing exactly one pound.
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