Final answer:
Jayden requires 56 grams of protein per day based on her weight of 70 kg, which corresponds to 224 kcal from protein per day.
Step-by-step explanation:
To calculate Jayden's daily protein needs in terms of kcal, we first determine the recommended daily amount (RDA) of protein. The RDA for protein is typically based on weight, and for adults, it is generally recommended to consume 0.8 grams of protein per kilogram of body weight. Jayden weighs 70 kg, so we'll multiply 70 kg by 0.8 g/kg to find the total grams of protein she should consume per day.
Jayden's protein requirement: 70 kg * 0.8 g/kg = 56 grams of protein per day.
Next, we convert the grams of protein to kcal. Since protein contains approximately 4 kcal per gram, we can find the total protein energy requirement by multiplying the grams of protein by the kcal per gram of protein.
Jayden's daily protein requirement in kcal: 56 grams * 4 kcal/g = 224 kcal.