21) Amaranth
You have probably heard about amaranth if you ever were on a weight-loss diet. It is a substitute for many cereals, and it is considered a pseudocereal itself, but without the extra calories of wheat and other staple foods. Amaranth is a source of dietary fiber, but not everybody knows that it is also rich in calcium. It is actually an excellent source of this micronutrient.
One cup of cooked amaranth contains 116 mg of calcium. Considering that the calorie count is very low, you can eat more than one cup anytime without any worries. Most amaranth bars out there are seasoned and sweetened, so be careful and look at the ingredients before buying, just in case.