Cashews are rich in a range of nutrients. One ounce (28 grams) of unroasted, unsalted cashews provides you with around; Protein: 5 grams, Fiber: 1 gram, Vitamin K: 8% of the DV and many more. Cashews are low in sugar and rich in fibre, heart-healthy fats, and plant protein. Theyâre also a good source of copper, magnesium, and manganese â nutrients important for energy production, brain health, immunity, and bone health.