I want to talk briefly about dietary proteins, or the proteins that are in the foods we eat. Now, if you're raising children, you're probably aware, or you've probably heard that proteins are a really important part of a balanced diet, because they form, sort of, the building blocks of out children's growing bodies. An example of that is the fact that protein make up a large portion of the muscle in our children's bodies and our own. But proteins also play a whole bunch of other important roles in our bodies and our children's bodies. So, for example, when we get sick, our immune system is activated. And, I don't know why my mother used to always make me wear a scarf when I had a cold, but [LAUGH]. So immune function, proteins are a very important part of that whole system. And then proteins act as transporters in a variety of different roles in the body. Proteins also help us maintain the right fluid distribution in our bodies. So the fluid stays where it should be because of the fact that the proteins keep it where it should be. So If we're thinking of proteins as the building blocks of our children's bodies, then we can think of amino acids as the building blocks of the proteins. There are 20 different kinds of amino acids. And we can actually make a lot of them. But there are 9 of them we call essential because we have to get these 9 from the foods that we eat, foods that are rich in protein. You probably already know a lot of these. But usually we think of, the first thing we think of are animal sources of protein, things like eggs and chicken, red meat and fish. Dairy products are also a good source of protein. Things like milk and cheese and yogurt. But there are also many vegetable sources of protein. And those are things like tofu, or nuts, or beans, and other legumes like lentils. The important thing to note Is that the animal sources of protein tend to be complete. That means that they contain all of the 9 essential amino acids in sufficient amounts to support growth, and repair, and maintenance of our children's bodies. Whereas the non-meat sources, for example, the dairy and the vegetarian sources of protein, tend to be incomplete. So they might contain all of the essential amino acids, but usually not in sufficient amounts to support growth if they're eaten by themselves. But here's the trick. If you combine vegetarian sources of protein with other foods, then you can end up with a meal that provides a complete set of amino acids. So, increasing the variety is the key. And some of these dishes are actually the traditional foods that we think of, like Mexican beans and rice, or Indian dal and rice. These foods naturally complement each other and provide you with a complete set of amino acids. As with all diets, variety is the key to a healthy vegetarian diet.