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.
There is a right number of calories for you to eat each day. Find your number in the table below. For example, a 60-year-old, sedentary woman should aim for 1,600 calories a day, while a 60-year-old, sedentary man should aim for 2,000 calories a day. You could use up the entire amount on a few high-calorie items, but chances are you won't get the full range of nutrients that your body needs.