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Sounds a lot like the Atkins diet, which is certainly not safe as it is particularly hard on the heart and kidneys - digestion of carbohydrates releases water, where digestion of proteins consumes water.

Like PR_Glen said, fad short-cut diets do not create long term results. To take weight off, one needs to burn more calories than they consume. While dieting can reduce the caloric intake, it also lowers the metabolism - thus the dieter will gain even more weight when they resume their normal caloric intake. Exercise, however, increases ones metabolism so can be used alone to lose weight (obviously, this assumes a relatively normal caloric intake) or be used in conjunction with a weight-loss diet plan.

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