You have to make healthy food more available to them than unhealthy food. Stop buying unhealthy snack food. Keep a plate of pre-washed & cut veggies & fruit on the top shelf of the refrigerator at all times. Put a large bowl of mixed fruit out on the counter (apples, oranges, bananas) & a plastic container (w/ a lid) full of granola. You can also SNEAK nutritious ingredients into their favorite foods. Here is link to some recipes from Parenting Magazine: http://www.parenting.com/parenting/article/0,19840,1595046,00.html

They emulate you, so I had to change my own habits. How could I preach healthy eating to my children if I was gobbling sweets? You have to be aware that they ‘re watching you.