Cashews are the nuts produced by the cashew tree. The magnesium found in cashew nuts is essential for regulating the metabolism of fat and carbs, which may help you lose even more weight. Cashew nuts are rich in magnesium, and magnesium can be found in reasonable quantities in cashew nuts. Cashews are considered among the best sources of protein, a crucial nutrient that plays a significant part in weight loss, and are, therefore, among the best nuts to consume if you are trying to trim down.