My boyfriend has been following the South Beach Diet for about.... 7 months now? It follows much of those guidelines that you mentioned and it's not meat only. : )
It has actually helped everyone in our house's eating habits. In fact, he has lost 35 lbs. with very little exercise. The South Beach Diet was no actually designed as a weight loss diet, it was designed to help those with pre-diabetes get their insulin under control and had the added benefit of weight loss.
We still indulge from time to time but he doesn't gain weight immediately from eating it because his metabolism has changed and so has the way he processes food.
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