18. I know how I should eat and exercise. Do I do either? No. How bad is my health going to be later on?

You shouldn't just be concerned about health problems in the future. If you want to feel good, function better, and think more clearly, your quality of life will improve today if you do a few simple things—and the side effect is that you'll live longer.

For fitness, try walking. You won't dread it, and it's easy to incorporate into your daily life—walk to a lunch place a little farther from work, walk up stairs. Get a pedometer and aim for 10,000 steps a day.

To improve your diet, eat an ounce of nuts—about a palmful—daily. Walnuts, almonds, and hazelnuts have many of the nutrients you need, and they'll satiate you so you won't forage for doughnuts.

And finally, drink water. It's difficult for humans to differentiate between thirst and hunger. If you feel a desire to put something in your mouth, your first response should be water. If that's not enough, then get food—like nuts. — Mehmet Oz, MD

19. I don't want to get wrinkles, but I don't want to have plastic surgery or injections in my face, either. Worriers develop worry lines, don't they?

You're right—our faces reflect where our minds are, so when we worry, that's what we show. There are a few noninvasive steps you can take to reduce lines. I know a woman who swears by Frownies, little pieces of tape you can put on your frown areas at night when you go to sleep to keep you from cultivating lines. Also, get your eyes checked. Chronic squinting can cause wrinkles to develop. If your eyes are okay, look into other ways to channel your stress, like exercise. And if you're going to worry, do it with sunscreen on! — Ranella Hirsch, MD

(Dr. Hirsch is a dermatologist in Boston.)

Still stressing? Find out why "Just let it go" doesn't work