Sentence:  Bearing this fact in mind will help dispel the confusion and apparent contradictions that surround us in the field of nutrition—the many individual claims as to the "ideal diet", for instance, the high-carbohydrate diet, the milkless diet, the breadless diet, the meatless diet, the fruit diet or the <WSD>fruitless</WSD> diet, the high-protein or the low-protein diet, and innumerable variations. 
Meaning of the word marked with <WSD> tags:  Of a diet, etc.: without fruit.