It can be frustrating to get or stay healthy with all the misinformation floating around out there. Sometimes, it’s just that the science has to catch up or we’ve learned new things. At other times, there’s a company trying to push products that don’t actually do much. We’ve pulled together some common health myths so that you know what to watch out for.

Eat As Little As Possible to Lose Weight

In most cases, doctors would probably remind you that the period after a starvation style diet can be tough on the scale — and that doesn’t even touch on the potential harm a person can do by really under-eating in the long term.

Cracking Your Knuckles Leads to Arthritis

It might sound annoying to some people, but it won’t cause arthritis.

The Flu Shot Gives People the Flu

While a small number of people might feel a little sore or fatigued after getting their flu shot, that’s not because they somehow have the flu. Just ask someone who’s actually had the flu recently what the symptoms are really like.

The More Sore You Are, the Better the Workout

The amount of soreness you feel after a workout can depend on the type of workout you did and a number of other factors. It doesn’t necessarily mean it was better, though.

Sugar Makes Kids Bounce Off the Walls

This one is more about the expectations of the parents than it is about the actual effects of sugar. Granted, too much sugar isn’t great for a number of other reasons.

You Have to Hit Those 8 Glasses a Day

Some people need more, some need less. It depends on the person. It depends on the day.

Try to Eat As Little Fat As Possible

Ah, the 90’s. You gave us The Fresh Prince of Bel-Air (amazing) and extremely low fat diets (less amazing). While some people might need to eat very little fat depending on health conditions, it’s not always ideal for everyone.

Crunches Remove Belly Fat

Crunches can do many wonderful things for your body, when done correctly as part of a general workout plan that fits your needs. They can’t, however, ‘spot reduce’ fat.

The More Vitamins the Better

It’s absolutely possible to overdo it on the vitamins. Just because you can buy them off the shelf at the grocery store doesn’t mean you shouldn’t talk to your doc about them first.

Swimming & Eating, Eating & Swimming

There’s no evidence that swimming right after you eat will cause cramping. Just try to wipe the ketchup off before you dive into the pool.