Some people are concerned that the amount of protein in a vegan diet would not be enough for people high requirements such as: top athletes; pregnant women and their developing babies. This is not true. If the diet has the right combination of the different types of protein in the right amount.
Amino acids are the building blocks of protein, 20 of which are essential amino acids because our bodies cannot make them from other nutrients and we should eat them in the right balance to stay healthy.
The protein from cereals (i.e. starchy carbohydrates like rice and wheat) are lysine, an essential amino acid. Whereas the protein from pulses (such as beans, lentils, and peas) are low in methionine; another essential amino acid. Together cereals and pulses complement each other and give the right balance for a healthy vegan diet. A diet that contained both these foods in at least two meals a day would provide sufficient protein.