A healthy vegan diet that is well-planned can be very beneficial To your health. As long as you make sure to incorporate complete proteins.
A protein is considered complete when it has all 9 essential amino acids. These complete plant proteins have a much better protein to amino acid ratio than meat, which makes the protein more absorbable. Therefore, complete plant proteins are a higher quality form of protein. To calculate how many grams of protein you need per day, multiply your body weight by .36. For example, a 120 pound female only needs 43 grams of protein each day.
That is 100% achievable on a vegan diet with complete proteins.
A list of complete plant proteins: