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.
How many calories does a person need per day? WebMD states that females ages 19 through 30 who are sedentary should consume between 1,800 and 2,000 calories per day. If they are moderately active they should eat up to 2,200 calories. If they are highly active then they should eat 2,400 calories.