By "砂糖ダイエット" I mean diet based on heavy consumption of sweets.


Yes it is perfectly grammatical, but I haven't heard of such a method. Please make sure you really want to say 砂糖 (sugar) but not 糖質/炭水化物 (carbohydrate), because a few people actually seem to be talking about "(高)炭水化物ダイエット" (high-carb diets).

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