Compositions comprise an amount of cinnamaldehyde that is orally tolerable, thus avoiding an unpleasant mouth feeling, and also tolerable in the gastrointestinal tract. The amount of cinnamaldehyde is effective to increase at least one of energy expenditure, sympathetic nervous system activity, or fat oxidation, relative to a composition lacking cinnamaldehyde but otherwise identical. The composition comprising cinnamaldehyde can be used in a method to support weight management or promote weight loss, a method for preventing obesity or overweight, and a method for treating obesity or overweight. In an embodiment, the composition comprising cinnamaldehyde is administered to a human. The composition comprising cinnamaldehyde may be a medicament, a food product or a supplement to a food product.
