9. You consume too many sugar and dairy products.
After you leave a piece of fruit on a counter for a while, it starts to look a little different. It becomes brown because its sugar reacts with its proteins. And the same reaction happens in our bodies when sugar starts to react with collagen. Your skin becomes dull and sallow.
There are also some researchers that say dairy products can make you look older since it could increase inflammation. This leads to oxidative stress which can be the main reason for premature aging.
