Nuts..

 

The human body requires protein to function; it's essential for repairing and creating new cells (per MedlinePlus). 

A lack of protein can lead to a weakened immune system, muscle loss, and poor hair and skin health, among other things (via Health). The most common food source to get this from is animal products like meat or eggs. But many nuts pack a powerful punch of protein, making them a great option.

Thankfully, the nut with the highest protein content per serving is also the one that is the most available: peanuts. As a note for those with allergies, Harvard Health puts it best: "Peanuts aren't nuts. They are actually legumes ... But like tree nuts, peanuts can be eaten as a filling snack or as a protein-boosting ingredient" (per Harvard Health Publishing).

A one-ounce serving of peanuts contains seven grams of protein. That is nearly equivalent to the amount in one extra large egg. The next top most protein-rich nuts are almonds (six grams), pistachios (5.7 grams), cashews (4.8 grams), and hazelnuts (4.3 grams). However, there is a literal added value to peanuts.