Final answer:
When gaining weight, an individual should focus on consuming more calories than they burn by monitoring food portions and choosing calorie-dense foods.
Step-by-step explanation:
When gaining weight, an individual should focus on consuming more calories than they burn in order to have a calorie surplus. This can be achieved by increasing food portion sizes and choosing calorie-dense foods. It is important to monitor food portions and ensure that the energy consumed from food exceeds the energy expended by the body. By eating in excess of daily energy requirements, the body can gradually accumulate stored body fat and promote weight gain