Dennis wants to gain weight, primarily as lean tissue. in addition to performing resistance exercise regularly, he should a. supplement his diet with essential amino acids and limit his total fat intake to no more than 10% of total kilocalories b. add nutrient-dense, healthy sources of energy to his diet, including fatty fish, whole-grain cereals, nuts, peanut butter, and olive oil. c. increase his protein intake to 60% of total energy intake, eat more complex carbohydrates, and take a multivitamin/multimineral supplement. d. avoid aerobic activities on the days he doesn't lift weights and eat about 50% of total calories from saturated fat.

The correct answer is: B. add nutrient-dense, healthy sources of energy to his diet, including fatty fish, whole-grain cereals, nuts, peanut butter, and olive oil.

Explanation: This option is the best choice because it contains a variety of foods through which Dennis can obtain all the macro nutrients needed for optimal health and functioning. This diet is especially high in protein and healthy fats, which combined with his exercise regimen, will help Dennis gain weight in the form of lean tissue. Options A and C are incorrect because they involve supplementation which is unnecessary since Dennis can obtain all the nutrients he needs through his well balanced diet alone. Option D is incorrect since high levels of saturated fat are harmful to a person's health.