1) Special proteins produced by the body in response to foreign substances including bacteria and viruses; there are five structurally distinct classes of immunoglobulins produced by plasma cells in the bone marrow and other lymphoid tissue that bind to and neutralize foreign substances (antigens).
People give up eating meat and animal products such as milk, cheese, and eggs for many reasons. But doing so may increase the risk of anemia, a potentially serious condition in which the body does not make enough oxygen-bearing red blood cells. For vegetarians who eliminate meat, anemia can be due to an iron deficiency.
Mild anemia is easy to catch up with with the right combos of food. The fruits and juices you listed are great sources of C. Try Multi-grain Cheerios - but skip the milk - with OJ for breakfast. Turkey has iron as does beef. Try whole pieces instead of ground or processed. Also Farina (hot cereal) is a great source. When eating the iron sources, mix with C and B for absorption - but skip the dairy and coffee/tea - those will only block and flush - a waste of your eating time! Keep on those iron pills and eat right and you should see great gains in 4-6 weeks.