Trend Diets Why Are They Bad? – Unhealthy – Some of the diets would like for you to skip meals, this can NOT help you in losing weight. Plenty of the trend diets don't permit you to eat a balanced diet, grape fruit all day. Virtually all the fad-diets make folks feel short-tempered and like they should fallow all of these rules and guiding principles. You may lose a little weight, however it is water weight mostly. – Trend diets restrict your food decisions and jail you to their foods.