Im 19 and weigh 170 how can you lose weight?

You should have no worries, this is a minor fix, but it will take up some time, so be prepared. :)

~Start yourself with a healthy breakfast as in CheeriOS (which helps you heart), or Special K. Adding an Apple to this is even better. Any fruit will do. Avoid Fattening Drinks and snacks; water should be the best option.

~Once you are done, you should either go to the gym or work out at home. The gym should supply you with all the things you need, but at home you could exercise by doing crunches, jumping jacks, or push-ups. Running around your neighborhood is another good option.

~At lunch, you need to commit yourself to a healthy diet. You don't need any Hamburgers, french fries, or anything fattening. What you should eat is a veggie wrap, tuna sandwich, a salad, fruit cup, yogurt, or anything in that category.

~If you have some free time, don't watch T.V., Go outside and get some fresh air, getting outdoor oxygen is the best option for a healthy lifestyle.

~For dinner, I suggest you eat your regular dinner as you usually do. You may do this, but eat 30% less than normal. (example:if you are ordering a Pizza, and you eat 4 slices, eat 3 or 2 1/2)

~Avoid dessert. Sugary foods are the last things you want to eat at this point. If you are still hungry, eat some yogurt or a fruit.

~Go to sleep at a healthy hour. Getting sleep is very good for your health. Wake up at a good time from 7 to 9. (Although don't force yourself out of bed, because that is not healthy for your brain.)

~Continue this until you are comfortable with your body. Weigh yourself everyday and keep track of your weight, and make a chart to see how much weight you lost.

Hope I could help!