Feta cheese is one of the most keto-friendly cheeses you can eat. A one-ounce serving contains just 1.16 grams of carbohydrates, zero fiber, 6 grams of fat, and 4 grams of protein. That high-fat, very-low-carb ratio fits comfortably within a standard ketogenic diet, even if you’re sticking to a strict 20-gram daily carb limit.
Feta’s Macros at a Glance
Per one-ounce (28-gram) serving, feta cheese breaks down like this:
- Fat: 6.03 g
- Protein: 4.03 g
- Total carbs: 1.16 g
- Net carbs: 1.16 g (feta has no fiber)
- Sodium: 260 mg
Those numbers mean you could eat three or four ounces of feta in a day and still use fewer than 5 grams of your carb budget. In practice, most people use feta as a topping or ingredient rather than eating it in large blocks, so a typical serving barely registers on your carb count.
Why Feta Works Well on Keto
Beyond just being low in carbs, feta has a few qualities that make it especially useful on a ketogenic diet.
First, it’s calorie-dense relative to its volume, which helps when you need to hit your fat targets without adding a lot of bulk to meals. A couple of crumbles go a long way in a salad or omelet. Second, its strong, salty flavor means you tend to use less of it compared to milder cheeses like mozzarella, naturally keeping portions in check.
Feta also contains a fatty acid called conjugated linoleic acid (CLA), which is found in higher concentrations in cheeses made from sheep’s milk. Research on sheep’s milk feta found CLA levels around 0.66 to 0.75 grams per 100 grams of fat, peaking during the cheese’s ripening stage. CLA has been studied for its potential role in supporting healthy body composition, though the amounts you’d get from cheese alone are modest.
Sodium: A Keto Advantage
One thing people often notice about feta is how salty it tastes, and that saltiness is actually a benefit on keto. At 260 mg of sodium per ounce, feta helps replenish electrolytes that your body flushes more quickly when carbohydrate intake is low. Many people on keto experience headaches, fatigue, or muscle cramps in the first few weeks, often called “keto flu,” largely because of depleted sodium and other electrolytes. Salty foods like feta can help offset that without needing to reach for supplements.
Lactose Is Minimal
If you’re avoiding lactose on keto (or in general), feta is a safe choice. It contains roughly 0.13 grams of lactose per 125-gram serving, which is classified as low by Monash University’s FODMAP research. That tiny amount is well below the threshold that causes symptoms for most lactose-sensitive people. The brining and aging process breaks down most of the lactose, leaving very little in the finished cheese.
How Feta Compares to Other Cheeses
Most hard and aged cheeses are keto-friendly, but feta ranks among the lowest in carbs. Cheddar, Parmesan, and Brie are all comparable at around 0 to 1.5 grams of carbs per ounce. Softer, fresher cheeses like ricotta and cottage cheese tend to be higher in carbs, sometimes reaching 3 to 6 grams per serving, and are worth tracking more carefully.
Where feta stands out is its protein-to-fat balance. It’s slightly lower in fat and higher in protein ounce-for-ounce than cream cheese, which makes it a better option if you’re trying to keep protein intake adequate without overshooting your fat macros. For people who find it easy to hit fat targets but struggle with protein, swapping cream cheese for feta in recipes is a simple fix.
Practical Ways to Use Feta on Keto
Feta’s crumbly texture and tangy flavor make it versatile in low-carb cooking. It works well crumbled over green salads with olive oil, stuffed into chicken breasts with spinach, or mixed into scrambled eggs. You can blend it with olive oil and herbs into a dip for raw vegetables, or bake it with cherry tomatoes for a simple side dish.
Because feta doesn’t melt smoothly the way mozzarella or cheddar does, it holds its shape when baked. That makes it a good choice for dishes where you want distinct pockets of cheese rather than a uniform melt. In Greek-style keto meals, pairing feta with olives, cucumbers, and grilled meat gives you a satisfying plate with almost no carbs to speak of.
A one-ounce serving is about the size of a pair of dice, or roughly two tablespoons when crumbled. Most keto dieters find they can use feta freely without measuring, given how little impact it has on daily carb totals. Even a generous three-ounce portion adds only about 3.5 grams of net carbs to your day.