Final answer:
A 143 lb cross country runner should consume between 78 and 91 grams of protein daily, depending on the intensity of training or competition.
Step-by-step explanation:
To calculate the protein requirements for a cross country runner weighing 143 lbs, we first convert the weight into kilograms by dividing by 2.2, resulting in approximately 65 kg.
Based on nutritional guidelines for athletes, a runner of this type may require between 1.2 to 1.4 grams of protein per kilogram of body weight per day, especially during periods of intense training or competition. We can calculate the protein needs using the lower end of this range (1.2 g/kg) and the higher end (1.4 g/kg).
Using the lower end of the range: 65 kg × 1.2 g/kg = 78 grams of protein per day
Using the higher end of the range: 65 kg × 1.4 g/kg = 91 grams of protein per day
Therefore, a cross country runner weighing 143 lbs should aim to consume between 78 and 91 grams of protein daily to meet their nutritional needs for their sport.