If your parents will listen, you could reason with them, asking to slightly alter the family's diet to make it a bit healthier. You are not going to get everyone throwing away chips and snacking on lettuce leaves in a day. It's best to start small. 'Hey mum, instead of getting 3 packets of biscuits this week, could we maybe only get 1 (or 2), and get some celery and hummus instead?'. If you have a alternative, and don't completely cut off all junk food, your family will be more likely to come around to the idea themselves, as opposed to you pushing it on them.
You don't need your family to change because you want to. If they won't alter their eating habits, it doesn't mean you failed. You can change your life by cutting out snacking, and eating healthy all on your own. I'm sure your mum/dad buys bananas and milk = healthy milkshake! I'm sure they buy apples, oranges.. fruits to eat when you are a bit hungry. You'll have bread and tomato and lettuce for sandwiches (or a small salad!). To eat healthier, doesn't mean having to revamp your whole pantry. Just cut out on a bit of the sugars and bad fats. Once your family see how healthy you look, they will surely join in as well!
Just start doing it yourself, you can't make them do it, but meaby once you start doing this they will realize somethings and copy your actions. Ask your perents to buy you this stuff and tell them why you want this as well.
You could try talking them into it, like explain to them why eating healthy would do good for you guys and what are some risks of bad eating habbits. Gather some facts and explain, but if it does not work then there is nothing much you can do, at the end is there choice.
Do it yourself first and go from there.
You cant control how your family eats, they are adults and make their own decisions. If you want to choose to eat healthier simply inform your parents of your decision and politely ask that they buy things for you to eat as well that are a healthier option. If they dont want to spend the extra money, then make your own money and buy your own food and then prepare your own meals. Eating healthier is a personal choice...not one you can force onto others who dont want too.
this is very difficult to do. I am very athletic and health conscious but my family is not. I have tried many times. Trying to give them advice and tips is not always helpful. Instead, I volunteered to planning meals and going to the grocery store to get our meals. This has worked much better since my family is busy and does not want to bother with lots of planning and cooking. If you have any other questions about being conscious go ahead and funmail me. =)
For sure, little by little- eating healthy makes you feel better and sometimes it is just a matter of breaking traditional family eating habits. Use herbs and spices to add flavor to foods that are not on the usual menu.
Simply start with putting veggies and fruits in your cart when you go to the store. Go from there. I'm sure your parents wouldn't mind.