I've read that Legumes are the seed of a plant like peas and beans. Aren't grains also the seed of a plant. Kind of confused about the difference. Thanks.

Grains are (usually) the seeds of grass plants, such as wheat, rice, corn, oats. Some grains are seeds of other plants, such as quinoa and amaranth.

Legumes are seeds from the Fabaceae family of plants which include beans, clovers, and Lupines.

Grains are usually memeber of the Poaceae (grass) family.

I cannot think of any that are not off the top of my head.

Peanuts are Legumes ; )

The above posters are correct.

Were you wondering about other differences, such as nutritional? Beans have a higher protein content, but it is usually less efficiently used by the body. However, they are a good source of protein and other nutrients. Their carbohydrates are absorbed more slowly than the starches from grains usually are.

I like both grains and legumes, myself.:hungry:

Many grains and most beans contain slightly toxic chemicals which make them difficult to digest without cooking or sprouting. Wheat contains chemicals which can bind iron in the body, causing anemia, if wheat makes up too large a portion of the diet. I understand corn also can cause dificiencies, this time with niacin, if it is the major part of the diet. A varied diet is the safest. There are so many vegs, fruits, grains, and legumes to choose from, yet humans mainly subsist on only a few.

Wheat contains chemicals which can bind iron in the body, causing anemia, if wheat makes up too large a portion of the diet.

That is true, but also note that the yeast in risen bread, esp whole grain bread, helps "turn off" the processes that bind iron, so that we can absorb more of it.

Legumes contain large amounts of nitrogen fixing bacteria in the roots :p

it is actually pretty easy once you look a little deeper into it:
they are classified by the way they grow, like fruit and vegetables for example
Legumes grow in a pod (like a pea pod) which splits in two and the seeds are attached to the sides of the pod.
http://www.fotosearch.com/comp/EYW/EYW181/ffo_037.jpg
Grains are each enclosed it their own shell, and the walls of their shells usually unite, such as wheat or rice.
http://shigeyoshi.jp/photo/archives/140.jpg

they also differ in size and texture when cooked