By Amanda Schupak Illustrations by Lorena Spurio

Here on the Well desk, we’re constantly asking experts for research-backed advice on how to eat better, stress less and generally live healthier, happier lives. But which habits really make the biggest difference?

To find out, our reporters went back to leading specialists they’ve interviewed over the years and asked them: What is the one health tip you learned in your work that you swear by? These 35 tricks, life hacks, rules and reminders span nutrition, sleep, mental health, fitness, sex, productivity and more. They all meet Well’s standard for excellence with a little extra credibility — they are practiced by the people who preach them.

When I find myself stuck in a pattern of negative thinking, I try not to complain for seven days. It retrains your brain to stop going down a negative path. I write “Don’t complain!” on a sticky note right by my bed so I see it when I wake up.