The rda for protein increases by an additional grams per day during pregnancy.

The RDA for protein increases by an additional 25 grams per day during pregnancy.  Protein RDAs are calculated using 0.8 grams of protein per kilogram of body weight, which means an adult weighing 68 kilograms needs at least 54 grams of proteins each day . The RDA for pregnant and nursing women is a bit higher because of the protein needed for the growth of fetus, it is about 71 grams of protein per day.

It provides a medium for cycles that provide nutrients to living organisms.