Other seafood sources for high iron and B12 include oysters, trout, salmon and haddock. For people over 50 who must limit saturated fat and cholesterol, seafood sources make superior choices to meats for building up your blood.
More specifically, sedentary men ages 19 to 30 need 2,400 to 2,600 calories; 31- to 50-year-old men require 2,200 to 2,400 calories; and sedentary men over the age of 50 need 2,000 to 2,200 calories each day to maintain a healthy body weight.
Self-reported average energy intake of 2,640 calories for men and 1,785 calories per day for women is within current USDA recommendations. However, since the majority of men and women in the U.S. are overweight or obese, many are eating more calories than they require.