You may not know it, but if you're on a low-carb diet, you're probably already doing modified keto anyway. Brett Osborn, author of "Get Serious: A Neurosurgeon's Guide to Optimal Health and Fitness," tells Men's Journal that at its core, it's really just about "healthy living." That means introducing more lean proteins, fruits, and vegetables into your diet to get the nutrients you need to stay healthy. Think salmon, tofu, lean beef, chicken thighs, and whole eggs. And while eating more carbohydrates is encouraged, that doesn't mean you should rely on rice, pasta, and bread. Instead, eat more beans, seeds, nuts, berries, whole grains, and legumes.