Which prediction can be derived from the hypothesis that a supplement will improve fat loss by suppressing appetite?

The correct answer is supported by the premise of the hypothesis that a supplement aims to improve fat loss specifically by suppressing appetite. If the supplement effectively reduces appetite, it is logical to predict that subjects will consume less food, which aligns with desire to lose weight.

When appetite is suppressed, individuals are less likely to feel hungry or overeat, leading to a decrease in caloric intake. This lower intake, combined with the body's energy expenditure, would contribute to fat loss, demonstrating a direct effect of appetite suppression on weight management.

The other options do not align with the hypothesis. For instance, predicting that subjects will gain weight contradicts the idea of fat loss through appetite suppression. Similarly, suggesting that subjects will eat more after taking the supplement goes against the intended effect of appetite control. The idea that subjects will lose weight regardless of diet also undermines the hypothesis, as appetite suppression would not guarantee weight loss without considering dietary habits and caloric balance.