Answer:
1. Tuna (Protein content: 32g per 100g)
2. Breast chicken (Protein content: 31g per 100g)
3. Cheddar (Protein content: 25g per 100g)
4. Walnuts (Protein content: 16g per 100g)
Step-by-step explanation:
1. Tuna. Tuna is rich in essential amino acids (i.e., lysine, methionine, cysteine, threonine and tryptophan), and omega-3 fatty acids, which helps to prevent cardiovascular diseases. Moreover, this food is an important source of vitamin A, B Group vitamins (i.e., thiamin, riboflavin, niacin) and minerals (i.e., calcium, phosphorus, iron, etc.) (Fatimah et al. 2019).
2. Chicken breast. Chicken breast is low in fat and an excellent source of protein, vitamins (vitamin B6, niacin), and many essential minerals (selenium, phosphorus,iron, calcium). Chicken is a rich source of methionine, the precursor of homocysteine (Bansal and Joshi 2017).
3. Cheddar. Cheddar cheese is produced from milk, which has a good content of calcium that helps to prevent osteoporosis and vitamin K. This food has significant quantities of essential amino acids (e.g., lysine, threonine, and tryptophan) (Gueimonde et al. 2019).
4. Walnuts. Walnuts are rich in fats (lipids), especially omega-3 fatty acids, which are required for normal brain function (Haider, Saida, et al. 2011). Moreover, walnuts have a high content of arginine amino acid.