Naturally, as a Mediterranean lifestyle coach, I teach Mediterranean cooking.
My family is big on olives, olive oil, tomatoes, yogurt, feta cheese, and pretty much all things Mediterranean. It's pretty easy for us to adopt a healthier diet when our palate is already accustomed to these tastes.
But if you prefer the taste of butter, meat, and takeout, then it may be more difficult to make that change. Below are a couple of quick ways to help you adjust your palate.
Eat at least seven servings of fruit and/or vegetables per day. Pack tangerines in your bag, chomp on dried figs for dessert, eat a salad every single day. I promise if you do this, you won't have room in your stomach for a full cheeseburger and fries.
Eat beans/legumes at least twice a week. Packed full of fiber, protein, and folate, legumes are a great, inexpensive food that is extremely versatile (black-eyed peas are awesome on top of brown rice; edamame are wonderful on a salad; cranberry beans are great as a stew with coarsely chopped root vegetables—think carrots, sweet potatoes, parsnips).
Still unsure where to begin? Take a cooking class! Cooking classes are a great gift to yourself—it's the ultimate gift that keeps giving. Look them up at your local university, community college, local food cooperative, or local restaurants.