These include omega-3s, such as those found in salmon and sardines, as well as monounsaturated fats present in avocado, walnuts, almonds and sunflower seeds. If you're planning to follow the keto diet, consider consulting with a registered dietitian to determine the most balanced diet possible, as well as any supplements you may need to take. Getting a balance of nutrients on the ketogenic diet can be challenging, which is “no surprise because you’re essentially cutting out healthy whole grains, fruits and some vegetables,” says Devje.