The ONLY way to lose weight is to "burn" (use) more calories than you consume (eat). If you eat a lot of oily, fatty foods, this is going to be really hard, unless you step up activity levels. Here's why: fats and oils have twice the calories of similar portions of other foods. Of course, while you might eat a cup of Greek yogurt, you're not likely to eat a cup of, say, peanut butter, still it's easy to eat too much of that tasty spread. Did you know that two level tablespoons of peanut butter is considered a reasonable portion? Yet most people will slather almost a quarter cup on their PB&J sandwich, which means they're eating a LOT of fat calories and just calories period. Here's the thing: fat tastes good! And our bodies love to consume it. But our brains need to regulate what we take in. We need to eat smart, not just what tastes good, but what's good for us. For really good advice on the subject, check out www.choosemyplate.gov --it's totally free, excellent, easy-to-understand nutritional information.