Though spicey foods don't play a significant role in boosting metabolism, they are healthy in other ways. Generally speaking, herbs and spices contain significant quantities of phyto-chemicals, antioxidents, and vitamins. These substances help protect the body and the brain from harmful free-radicals. But as Uncle B. stated, to get the full benefit from proper nutrition, a combination of aerobic and strength trainging exercises must be employed on a regular basis.
No one thing is going to boost your health. To make it simple, our bodies were designed to move and work, that is, to propell us around. Our brains were designed to learn and to solve problems. If we don't exercise our bodies, and challenge our brains, we decline more rapidly as we age. There is nothing we can do to completely stop aging, and deteriorating. But we can sure slow down the process, and enhance our life experience by maintaining healthy bodies and brains. And don't forget to nourish your spirit while you're at it. It helps your brain function better as you are more able to handle day-to-day stresses that can damage both body and brain.
Seeeeeeya; Goodweed of the North