Protein while using weight-loss injections

Medications like semaglutide and tirzepatide reduce appetite significantly — and that's part of why they work so well for weight loss. But there's a less-discussed side effect: eating too little.

Why protein is the priority

When total food intake goes down, protein is usually the first nutrient to fall short — because it takes more effort to eat (chewing, preparing) than other easy calorie sources.

Protein is the main nutrient involved in maintaining muscle mass. Insufficient intake, especially combined with a significant calorie deficit, increases the risk of losing muscle along with fat.

Signs your intake may be low

• small meals, often without a clear protein source;
• unusual feelings of weakness or fatigue;
• difficulty recovering after physical activity;
• hair loss.

What to do

There's no universal amount of protein — the need varies with weight, age, activity level, and goal, and should be calculated individually, ideally with medical or nutritional guidance.

In practice, it helps to prioritize a protein source at every meal (eggs, lean meats, fish, legumes, dairy) even when hunger is low — instead of relying only on appetite to guide what you eat.