Losing weight is a matter of using more energy ( which is measured in kilocalories or in every day terms, just "calories" ) than you take in. That is always the case no matter the regime or the diet. Anyone who claims differently is trying to sell someone something.
The best approach is to increase your exercise and track how much you eat.
Experts say it is best to lose no more than 1 - 2 pounds a weak. The more slowly the weight is taken off the greater the chance that it will stay off and the greater the chance is that the weight lost will be more fat than lean tissue ( you will be firmer instead of flabby at your goal weight ).
A fun system for teaching you how to track your dietary intake and weight loss is "The Hacker's Diet". It was made by an engineer who became rich and had everything he wanted in life except freedom from his life long weight problem. He decided to apply what he knew best, engineering principals, to weight management. The result is his free ebook, called "The Hacker's Diet". Totally free, no promotions, no gimmicks, no crazy rules. You can eat whatever you want.
I used the system years ago to *comfortably* take off 48 lbs and keep most of it off
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