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Researchers asked 938 volunteers to maintain a strict 800 calorie-a-day diet for two months, then split them into five groups, every following a different low-fat diet to preserve their weight. From the five groups, only those who kept the high protein, low glycemic index (GI) diet managed to maintain their weight over the following six months. The other put on 0.5 kg (1.1lb) on average. Those on a low protein, high GI diet the worst performing regime put on almost 2 kg (4.4lb).
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