The average American consumes more than 500 grams of protein per day, and the most popular protein sources are chicken and beef, according to a new report.
The report from the American Institute for Nutrition also notes that Americans tend to eat more protein from meat, dairy, fish and eggs than grains.
However, it also points out that some people are better at digesting plant-based foods than others.
The American Institute of Nutrition (AIPN) surveyed 1,000 people about their diets, and found that people who eat a lot of meat tend to be at a higher risk of diabetes.
The survey also found that those who eat less meat and more veggies are less likely to have Type 2 diabetes, while people who are vegans are more likely to get the condition.
The AIPN says the protein recommendations of some companies are based on their own personal preferences and the advice of their doctors.
The protein found in processed foods has a different amino acid profile compared to the amino acid content in plants.
For example, soy protein has more methionine than plant protein.
According to the report, one serving of plant protein contains about 4 grams of methionines, while a serving of soy protein contains just over 1 gram.
The study also found plant protein and animal protein contain similar amounts of vitamin D. The average person who eats plant protein, but does not eat meat, has about 40% of the vitamin D in their blood.
The vitamin D content of plant and animal proteins is similar, the AIPA says, but they are not nearly as high as in plant and human foods.