Final answer:
The main factor that predicts weight loss in response to a low caloric diet is adherence to the diet plan.
Step-by-step explanation:
The main factor that predicts weight loss in response to a low caloric diet is adherence to the diet plan. To lose weight, the number of calories burned per day must exceed the number ingested. The type of food ingested also affects the body's metabolic rate, with processing of proteins requiring the most energy.