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Protein is an
part of our diet. It helps us to build muscle and keep our bodies
. Protein is in many foods, including meat, fish, dairy
, and eggs. Vegetarians can find protein in beans, lentils, nuts, and
. Many people are eating too much
. Supermarkets are full of protein-
food and energy bars. Eating these could be shortening our
. The researcher said because most people sit down a lot, they are more
to eat more protein than they need. He said this
has "negative health
".