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Why don't we lose weight on diets? Nutritionist's opinion We received quite a few letters from the editor. "I can't lose weight" is the most common subject before summer vacation. It seems you need urgent help from our nutritionist! "A year ago I stopped eating fast food and sweets. I go to the gym three times a week, do abdominal workouts every day, and go for a jog every morning. And despite all these efforts, I'm barely losing weight.