jax hubbard is a nutritionist at downstate long island college hospital. hi, jax. >> hello! >> so, how can we keep our motors running all day long? >> well, to use your analogy, you need to make sure you always have gas in the tank. otherwise, your metabolism slows down, and that can lead to not doing well in class, sports, or other activities. >> i think i hear my mother reminding me to not skip meals. >> and she's right. but it's actually more than that. for some people, especially older adults, three meals a day do the trick. but for active teens, that's often not enough. >> so, are you saying teens should eat bigger meals? >> no. the key is not eating more, but eating more often. instead of three big meals, aim for five or six smaller ones. by eating something nutritious every three hours or so, you'll keep energized all day long. and try not to eat a large meal just before bedtime. >> i wouldn't dream of it. thanks, jax. >> my pleasure. >> with "health bites," i'm ellie. >> you can tell how fast an animal can run by the size of its eyes. well, sort of. it seems that ani