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These insta-pick-me-ups work in 10 minutes of less. Use 'em now, tomorrow or in 20 years. You'll always feel young.

The scent of peppermint incites the trigeminal nerve, which helps cue arousal and alertness, says Alan Hirsch, M.D., a neurologist and the founder of the Smell and Taste Treatment Research Foundation.

Stopping to smell -- or even just look at -- the flowers (any flowers!) can help reduce anxiety and make you feel happier, Dr. Hirsch says. The aroma of a sweet bouquet may also help you learn new things, he says.

Better-mood benefits -- like being cheerier, less stressed and more confident -- arrive after spending only five minutes outdoors, Dr. Lodge says. The best part? After that measly time, the effects can last for up to two hours.

Fiber helps slow your absorption of food, which keeps your energy percolating without a crash later, says SELF experts Stephanie Clarke, R.D., and Willow Jarosh, R.D. Avoid sugar-bomb cereals, though.

When people are put in a situation that mimics their younger years, they tend to look younger and reap health benefits, says study author Ellen Langer, Ph.D., professor of psychology at Harvard University. Who doesn't love a little nostalgia anyway?