Keto is a high-fat, very-low-carb way of eating. Most of your calories come from fat, a moderate amount from protein, and very little from carbs (what is the ketogenic diet?). Once you know which foods fit, day-to-day choices get easy. Here's a practical list.

Foods to enjoy

These are the building blocks of most keto meals (Harvard, Cleveland Clinic):

  • Protein: meat, poultry, eggs, and especially oily fish like salmon, sardines, and tuna
  • Healthy fats and oils: olive oil, avocado oil, avocados, olives
  • Non-starchy vegetables: leafy greens, broccoli, cauliflower, zucchini, peppers, cucumber, asparagus
  • Dairy: hard cheeses, butter, cream (whole, unsweetened)
  • Nuts and seeds: walnuts, pecans, almonds, chia, flax
  • Berries: in small amounts — they're the lowest-carb fruit

Foods to limit

These are keto-friendly but easy to overdo:

  • Cheese, cream, and nuts. They're allowed, but very calorie-dense — handfuls add up fast and can stall weight loss (more on stalls).
  • Packaged "keto" products. Bars, cookies, and sweeteners marketed as keto can hide carbs in sugar alcohols (net carbs vs total carbs).

Foods to avoid

These will push you out of ketosis (Harvard):

  • Grains and flour: bread, pasta, rice, oats, cereal
  • Sugar: candy, soda, juice, most desserts
  • Starchy vegetables: potatoes, corn, peas, winter squash
  • Most fruit: high in natural sugar
  • Legumes: beans, lentils, peanuts
  • Sweet drinks and beer

Choose better fats — this matters

Keto lets you eat a lot of fat, but the type of fat affects your long-term health. Harvard researchers stress building keto around unsaturated fats — olive oil, avocado, nuts, and fatty fish — rather than piling on butter and processed meats like bacon and sausage (Harvard). Same carbs, healthier plate.

A simple keto day

  • Breakfast: eggs cooked in butter or olive oil, with avocado
  • Lunch: big green salad with grilled chicken, olive oil, and cheese
  • Dinner: salmon with roasted broccoli and a drizzle of olive oil
  • Snack: a small handful of nuts or a few olives

A note on your health

Keto suits many people, but not everyone. Because the diet is high in fat, the quality of your fats matters for heart health, and people with certain conditions should be careful. If you have heart, kidney, or liver disease, are pregnant, or take medication for diabetes, talk to your doctor before starting — and consider yearly cholesterol checks if you stay on keto long term (clinical reference).

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