Shellfish
Lobster, clams, crabs, and mussels are all types of shellfish. Shellfishes are great for boosting the immune system because they contain various vitamins including zinc which helps the body fight various diseases. Zinc helps immune cells function as they are intended and can also help to combat various autoimmune diseases (autoimmune conditions are diseases where cells begin to attack the body instead of diseases). Having an excess amount of zinc is also harmful because it would hinder the functioning of the immune system. The key is to balance your zinc consumption and avoid taking more than the required daily amount.