Talk about happy trends. More and more yummy foods that used to be considered bad news are turning out to be good for you. First it was wine. Then olive oil. Chocolate. Guacamole. And now - coffee. (Hey, can ice cream be far behind?!)

What restored coffee's reputation? Caffeine. After years of being viewed with suspicion, caffeine has pulled a scientific switcheroo. Besides helping students pull all-nighters and weekend warriors jump-start their jump shots, there's now evidence that caffeine defends against type 2 diabetes, Parkinson's, asthma symptoms, post-workout soreness, and even hunger pangs. Cool.

It's not totally benign, of course. Is anything? So, our experts advise limiting caffeine to about 250 mg a day (the average cup of joe has about 100 mg) to avoid jitters and a possible boost in blood pressure. But few labels list caffeine content, so it's hard to tell how much is in what. Below, lists the caffeine content of a few popular drinks. It covers some timeless favorites along with the caffeine sources that are generating the most buzz. We checked the calories too, BTW, but most are pretty harmless.

DIET COKE

Everybody's default diet drink

THE CAFFEINE FIX: 45 mg
THE CALORIES: 0
THE OTHER STUFF: A lot of flavorings and colorings, not much else - call it caffeine lite

WATER JOE

For the purist: plain H2O with a jolt

THE CAFFEINE FIX: 60 mg in a 16.9-ounce bottle
THE CALORIES: 0
THE OTHER STUFF: Artesian water and caffeine, that's it - no additives, no carbonation

RED BULL

The energy drink that started it all

THE CAFFEINE FIX: 80 mg per 8-ounce can
THE CALORIES: 110
THE OTHER STUFF: Has taurine, a "detox" amino acid; B vitamins; loads of sugar - so beware the crash after the rush

ENVIGA

Controversial new green-tea drink

THE CAFFEINE FIX: 100 mg per 12-ounce can
THE CALORIES: 5
THE OTHER STUFF: Laced with 200 mg of calcium and green-tea antioxidants, but in trouble for claiming that it makes the body burn up extra calories

ROCKET CHOCOLATE

Candy with more zip than a cup of joe

THE CAFFEINE FIX: 150 mg per piece
THE CALORIES: 70
THE OTHER STUFF: Comes in trendy flavors like mocha latte; individually wrapped so you can stash in a pocket - but can you eat just one?

FUSION ENERGY

7-Eleven's new-ish "functional" brew
THE CAFFEINE FIX: 250 mg per 12-ounce cup
THE CALORIES: 0
THE OTHER STUFF: Freshly ground coffee brewed with an alertness-boosting blend of ginseng, guarana, and yerba mate

STARBUCKS

Coffee, just coffee

THE CAFFEINE FIX: 280 or so per 12-ounce cup
THE CALORIES: 0
THE OTHER STUFF: Starbucks coffee averages twice the caffeine of a regular 8-ounce cup of java, but the hit can vary wildly: in one study, by 200 mg on different days

SPIKE SHOOTER

Heavy-hitter energy drink

THE CAFFEINE FIX: 300 mg per 8.4-ounce can
THE CALORIES: 0
THE OTHER STUFF: Spiked with tyrosine, yohimbine, and a huge dose of vitamin B12; label warns you not to drink more than 1 a day


Disclaimer

This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.

This content originally appeared on Sharecare.com.