Our expert says:
When you eat low-GI carbs they get stored in the form of glycogen which makes your body retain water no matter what time of the month it is. The high-GI carbs are usually used up immediately for energy purposes. The storage of carbs in glycogen in the liver and muscles together with quite a bit of water, is also the reason why people lose so much weight (not necessarily fat!) when they start on the zero GI diet. The glycogen is used up within the first day or so and all the water is released, and the person loses lots of weight which of course strengthens the belief in the efficacy of the diet. If you stay on a low-fat, low-GI diet this change in weight will even out over time and you will start losing fat.
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