One of the healthiest diets, the Mediterranean diet, includes fish, seafood, and cheese as sources of animal protein. This diet is suitable for most people to improve health, prevent cardiovascular diseases and obesity, and improve the condition of the skin, hair, and nails. If you eat fish and seafood, you will likely get all of the necessary protein your body needs. The chances of you having a protein deficit are small. However, it is important to remember that fish will become an adequate replacement for meat only if ===it makes up at least 12 % of the daily diet. A study was conducted in Norway, in which the Haug family ate only fish dishes for 4 weeks to assess how it would affect their health and body condition. Before the study began, the parents and their sons underwent a complete medical examination. Tests after the end of the study showed that the total weight of the family decreased by 30 lbs. All family members had lower levels of bad cholesterol and sugar, and the adults had stabilized blood pressure readings. Before the experiment, the waist circumference of the father was 120 cm. After the four-week fish diet, his waist was 44 in, and the mother’s waist decreased by 1 in.