Fish delivers protein, and when you choose a fatty fish like tuna, salmon or trout, you're also getting omega-3 fatty acids.

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When following the keto diet, you'll want to consume a variety of low-carb, keto-friendly foods, like seafood, high-fat dairy products, and low-carb vegetables.

More moderate low-carb diets allow for a higher intake of carbs. When following very low-carb diets, like the keto diet, you must avoid or significantly restrict most higher-carb foods.