A common worry: does keto make you lose muscle? The answer is no — not if you eat enough protein and do some resistance exercise. Here's how to get it right.
How much protein on keto
Keto is a moderate-protein diet, not a low-protein one. A common clinical target is about 1 to 1.5 grams of protein per kilogram of your ideal (target) body weight per day (clinical reference). For someone with a target weight of 70 kg (154 lb), that's roughly 70–105 g of protein a day. Active people and lifters often aim a little higher, and individual needs vary. See how to set your macros.
The "too much protein" myth
You may hear that eating protein "kicks you out of ketosis" because the body can turn some protein into glucose. For most people, this is overstated — adequate protein is fine and important, and the bigger, more common mistake is eating too little protein out of fear. Don't undereat protein.
Protect your muscle
- Eat enough protein at each meal — meat, fish, eggs, dairy.
- Do resistance training — lifting, bodyweight exercises, resistance bands. This is the strongest signal to keep and build muscle, even while you lose fat.
- Don't crash-diet. A huge calorie deficit plus low protein is what risks muscle loss — on any diet.
A note for the gym
In the first weeks, your strength may dip while your body adapts to burning fat — that's normal and temporary. Moderate and heavy strength training generally recovers after adaptation (keto and exercise).
One caution: if you have kidney disease or another medical condition, talk to your doctor before adopting a high-protein or ketogenic diet — safe protein levels vary from person to person.