Complex Carbs

Chestnuts have a high fiber and high carb content. A 3-ounce serving of roasted chestnuts contains 4 grams of fiber and 45 grams of carbs.  The carbs that come from chestnuts are complex. Unlike simple carbs, complex carbs are digested slowly, which gives you even energy levels.

Rich in Vitamins and minerals

Chestnuts have a generous blend of B vitamins in moderately high amounts. The fat-soluble B vitamins help produce red blood cells, break down protein, carbs and fats for energy, promote healthy skin and enhance brain function. 

A 3-ounce serving contains 21 percent of the recommended daily value of B-6 15 percent of folate, 14 percent of thiamine and 9 percent of riboflavin.

Manganese

Chestnuts have a high content of the trace mineral manganese -- an antioxidant, which soaks up free radicals in the system and reduces the risk for cancer and heart disease. According to the University of Maryland Medical Center, manganese also plays a key role in the aging process. A 3-ounce serving of chestnuts contains just over 1 microgram of manganese, which is 50 percent of the recommended daily intake. Manganese also helps with connective-tissue production and blood clotting. 

Copper for Bone Strength

Chestnuts also contain 22 percent of the recommended daily value of copper per 3-ounce serving. Copper is a trace mineral that enhances bone strength, helps with red blood cell formation and nerve function and boosts the immune system.

Source: Healthy Eating