You sleep face down. 1
Women who sleep face down put a lot of pressure on their breasts and they begin to lose their shape. Experts don't recommend that you sleep to one side either. It's best to sleep face up.
You don't use a bra. 2

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If you think that your breasts should be free and hang naturally, great. Just don't be surprised if they begin to lose their elasticity. There's no way around it: Your breasts need good support in order to fight the forces of gravity.
Believe it or not, smoking is bad for your boobs. 3
Cigarettes aren't just bad for your lungs and overall health, they're also bad for you skin. Nicotine affects your skin's elasticity, and you guessed it, your boobs will droop.
You use the wrong bra could affect your breasts' perkiness. 4

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Using the wrong bra can be just as bad as using none at all. Get yourself a properly fitted for a bra. You'll be so happy you did.
You don't drink enough water. 5
Not drinking enough water causes your skin to lose its elasticity and wrinkles to form. This applies to your breasts, so make sure you hydrate.
You overexpose yourself to the sun. 6
During the summer, you wear shirts that expose your chest a little more but many of us don't protect that area with sunscreen. Sure, we love that sun-kissed look, but protect your skin because you'll begin to see wrinkles before you know it.
You don't wear a sports bra when working out. 7

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There are women who run, bike or work out with a regular bra. This is NOT where you want to skimp. Sports bras are designed to support your boobs while you jump up and down and prevent their sagging in the long run.
Your weight fluctuates. 8
Women who gain and lose weight constantly are more likely to have droopy breasts because their skin loses elascticity. When you gain weight, your breasts are usually the first to receive that extra padding. However, those boobs are also the place where you are likely to lose fat first.
You don't do pectoral exercises. 9
These exercises precisely target your chest and boobs. Do these every day and you'll see your perky results.
You eat junk food. 10
Junk food contains loads of grease and sodium, and those cause your breasts to lose the little collagen they have. Junk food also cause weight gain which leads to heavier and droopy breasts.