Currently, soy-protein isolate soy beans processed to remove carbohydrates and fat is the most common ingredient added to boost protein content in foods not naturally rich in the nutrient.

WSJ: Label Decoder: Protein Additives in Food

Antioxidants like lycopene and vitamin C, as well as soy protein and omega-3 fatty acids, help keep skin glowing.

CNN: What you eat can improve your health, mind, and appearance

Regular intake of soy protein and the omega-3 fatty acids in tofu, can reduce cholesterol levels by as much as 30% and LDL (bad cholesterol) by 30%-40%.

FORBES: The Triumph Of Tofu

Mr Rich had brought along some samples of his new invention, a concoction of soy-oil shortening, isolated soya protein, corn syrup and water, in the hopes of persuading them that this could taste as yummy, and whip as lightly, as heavy cream.

ECONOMIST: Robert Rich

In whipping up a soy-milk-and-blueberry shake from Herbalife's ShapeWorks protein powder, Heber was also promoting the controversial dietary supplement company.

FORBES: Supplemental Income

Staple crops like wheat, soy bean, rice and potato -- things that would provide carbohydrates, protein and fat -- they're the final end point.

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Tofu is a good option since its omega-3 fatty acids help regenerate new skin cells and reduce inflammation, while its soy protein has been shown to boost collagen.

CNN: What you eat can improve your health, mind, and appearance

Pea protein yellow peas that have been processed to remove carbohydrates and leave the protein is being added to baked goods, snack bars, drinks and cereals that aim to be protein rich while also appealing to people looking for vegan, gluten-free or soy-free products.

WSJ: Label Decoder: Protein Additives in Food