The fewer calories you eat, the faster you lose weight. The only reason to add fruit to a low carb diet, because fruit will slow down your weight loss, is that fruit might decrease cheating on sweets and starches, and also make you feel fuller and more satisfied, so you decrease your dead animal intake. Fastest weight loss is on the lowest number of calories and the lowest number of carbohydrates. Increasing your fat intake will make you feel fuller and also may decrease cheating on carbohydrates, but the price you pay is that fat has more than twice as many calories as protein or carbohydrate (9 calories per gram for fat, compared to 4 calories per gram for protein, and 4 calories per gram for carbohydrate), and additional fat calories can slow down your weight loss.