What does this mean? That if someone is given a burger, that if they only eat that 1/3 lb of meat, and not consume the remaining 2000 lbs of meat from that animal, you will suffer a curse? Or is it saying that if you butcher the animal, but say discard eating it's eyes and ears, and other bits people normally discard, that that brings about negative karma or something?
I don't understand the connection between not eating the entire animal, and health? Can you explain, with a citation possibly?
Are you referring to people who are new to vegetarian diets and are not getting sufficient proteins in their diets, or something like that? That's just developing the proper balance of types of food you need to eat. It's the same thing if all you ever do is eat red meat and get no other source of food, such as green vegetables. That can screw you up too.
What effects? Typical going to a nutritionist who specializes in the science of diet, can help if someone is not getting a proper balanced diet and is experiencing deficiencies. But I don't see where not eating the whole animal itself can have any effect. That's puzzling.
I can understand a "law" that says don't waste your animal parts when you butcher them because it wastes good resources, but I don't see how that affects the individual themselves, other than wasting resources. Not eating cow eyes, is not going to cause blindness, or depression or something. But in reality, if you really wanted all those other 'bits', then add hot dogs to your menu.