At first glance, Spinach may seem a good gutload choice. And it is, in small amounts from time to time. Spinach is a good source of Fiber, Protein, pro-formed Vitamin A, Vitamin C, Vitamin E, Vitamin K, Thiamin, Riboflavin, Vitamin B6, Folate, Niacin, Zinc, Calcium, Iron, Magnesium, Phosphorus...