And you are mostly water followed by protein, fat, skin and organ tissue.
We can't eat bones. Luckily we get all the calcium we need from eggs and veggies.
As for sugar, we've only got about a couple of table spoons floating around inside of us, tops. So we don't need much.
In fact, we don't need grains at all.
Make your meals mainly different proteins and organ meats with a lot of good fats. Eat veggies and fruit for your sugar.
Drink lots of water.
Remember, you are what you eat and if you don't eat what you are you're doomed to become something (or someone) else.
Read Nina Planck's book.