Beans, vegetables, and whole grains - More Healthful Protein Sources

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Some people think of meat as their main source of protein. But it is easy
to get plenty of protein without the fat, cholesterol, and other undesirables
in meat.

Beans, vegetables, and whole grains, in particular, have more than
enough protein to sustain a health-promoting diet. The American Dietetic
Association’s guidelines state that a diet including a variety of these
healthful plant foods provides all the protein you need.12 In years past,
some people thought that vegetarians had to eat foods in certain combinations—
grains with beans, for example—in order to get adequate
protein. However, it turns out that no special combining is necessary. A
diet including a variety of beans, vegetables, and whole grains will easily
give you more than enough protein, even without intentional combining
of foods.