Answer: B. weight loss
Step-by-step explanation:
Nutrient malabsorption is an significant factor of weight loss.
Food energy is used to fulfil the needs of the body, including protein synthesis, cardiac activity, body temperature regulation, muscle function, respiration and metabolism.
Increased physical activity and reduced food intake leads to weight loss due to nutrient malabsorption which indicates that the person need to take a proper diet to increase the energy for physical activities and other body functions.
Hence, the correct option is B.