Final answer:
A 120-lb gymnast requires approximately 43.2 grams of protein daily, calculated by converting their weight to kilograms and multiplying by the DRI for protein of 0.80 g/kg.
Step-by-step explanation:
To calculate the daily protein requirement for a 120-lb gymnast, we first convert the weight from pounds to kilograms. Since there are about 0.45 kilograms in a pound, the gymnast's weight in kilograms is 120 lb × 0.45 kg/lb, which equals 54 kg. Given the Dietary Reference Intake (DRI) for protein is 0.80 g/kg body weight, we multiply 54 kg by 0.80 g/kg to find the protein needed per day:
54 kg × 0.80 g/kg = 43.2 grams of protein per day.
Therefore, a 120-lb gymnast requires approximately 43.2 grams of protein daily for optimal health and performance. It's important to consider the balance of nutrients in the diet, as well as the role of regular exercise, in maintaining a healthy lifestyle.