We gathered some of the most common beauty beliefs and tested them against their claims. Here’s doodh ka doodh and pani ka pani for you.

Q: Is it true that 8 hours of sleep can help me lose weight?
A: Yes! When you don’t get enough sleep, your brain produces cortisol, also known as the “stress” hormone, which tells your body to store fat.

Q: Can holding a cell phone against your face make you break out?
A: Yes. Our cell phones are breeding grounds for germs, even more than doorknobs and toilet seats. Remember to wipe your phone down often.

Q: I’ve heard I don’t have to use anti-aging cream until I’m over 30. Is that true?
A: You are never too young to incorporate anti-aging products into your regimen. A daily application of sunscreen is extremely important. Over the counter creams with retinol, which helps with cell renewal, do a lot of good.

Q: Does shaving make hair grow back thicker?
A: It does not. It may feel like it does because the new hair has a blunt feel.