How to keep your strength while losing fat

When you're eating less to lose fat, the goal of training changes: keep the muscle and strength you have. Lifting heavy is the signal that tells your body to hold on to it.

Keep the deficit moderate

Losing about 0.5 to 1% of your body weight a week keeps most of your muscle. A deficit of about 500 calories a day is a good start for most people. Faster than 1% a week and strength tends to fall off quickly.

Keep the weights heavy

• Keep your main lifts in the same rep ranges with the same loads as long as you can.
• Cut volume a little if recovery suffers, rather than cutting the weight.
• Keep a rep or two more in reserve than usual. Grinding sets cost more on a diet.

Eat more protein

Push protein toward 2 g per kg of body weight a day. It helps hold muscle and keeps you fuller. More in how much protein.

What to expect

• Beginners can often still get stronger on a modest diet.
• Experienced lifters usually hold strength, with small drops near the end of a long diet.
• Higher-rep sets often drop first, because you have less energy. Heavy triples usually hold up better.

Tip: Weigh yourself several times a week and look at the trend, not single days. Water swings can hide a week of fat loss.

A plan that watches with you

Liftsmith logs weigh-ins (from your scale through Health Connect or Apple Health, or by hand) and warns you in a coach's note if your weight is dropping faster than 1% a week. Your workouts keep adapting to how your lifts are going, and your daily calorie estimate updates as your weight changes.