Collard greens are among a small number of foods that contain measurableamounts of oxalates, so over-consumption can cause problems for those with kid-ney disease, gout, vulvar pain, rheumatoid arthritis, or other conditions that mayrequire a low-oxalate diet. nutritional composition One cup of chopped and boiled collards provides 35 calories, 7.8 g carbohydrate, 1.7 g protein, 0.2 g fat, 3.6 g di