Basically, this is true; but did you know that the body needs B vitamins, especially vitamin B1, to be able to draw energy from carbohydrates? The same applies to the macronutrient fat, which cannot be burnt effectively, if there aren't enough coenzyme Q10 or L-carnitine available. Protein also requires a sufficient amount of vital substances such as vitamin B6 and magnesium so that it can be effectively converted and built up into the body's own muscle mass. As long as your metabolism is not balanced and you do not supply your body with the required nutrients in sufficient quantities, you should not be surprised if your fitness, condition and muscle build-up improve very slowly only. This is comparable to a 4-cylinder car engine, which only runs on three cylinders: it is useless to fuel this car with the best petrol - the car won't become faster if other parts are broken.
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