If there is one nutrition number worth paying attention to when you are losing weight, it is protein. Not because protein is magic, but because it does two things nothing else does as well: it keeps you full, and it protects your muscle while the fat comes off. Get it right and weight loss becomes noticeably easier. Get it wrong and you risk losing muscle along with the fat — which is exactly what you do not want.
So let us answer the question simply and honestly: how much protein do you actually need?
The simple target
For most adults who are losing weight, a good target is 1.2 to 1.6 grams of protein per kilogram of body weight per day (roughly 0.5 to 0.7 grams per pound). If you are very active or doing strength training, the higher end — up to around 2.0 g/kg — can help even more.
To make that real: someone weighing about 75 kg (165 lb) would aim for roughly 90 to 120 grams of protein a day. If you are carrying a lot of excess weight, base the calculation on a reasonable goal weight rather than your current weight, so the number stays sensible.
You do not need to hit this to the gram. Simply including a solid protein source in every meal gets most people close without any tracking.
Why protein matters so much for weight loss
Three reasons, and all three work in your favour:
- It keeps you full. Protein is the most satisfying of the three macronutrients. Meals built around it keep hunger away far longer than meals built around refined carbs or fat.
- It protects your muscle. When you lose weight, you want the weight you lose to be fat — not muscle. Eating enough protein signals your body to hold on to muscle, which also keeps your metabolism healthier.
- It costs more energy to digest. Your body burns slightly more energy processing protein than carbs or fat — a small but real bonus.
How to actually hit your target
The trick is spreading protein across the day rather than saving it all for dinner. Aim for roughly 20 to 40 grams per meal. Easy sources that are also low in calories:
- Chicken and turkey breast — lean, filling, versatile.
- White fish and prawns — very high protein for very few calories.
- Eggs and egg whites — a perfect breakfast anchor.
- Greek yoghurt and low-fat dairy — great for snacks and breakfast.
- Beans, lentils, and tofu — plant options that also add fibre.
Build each meal around one of these, add plenty of vegetables for volume, and you will naturally land near your protein target while staying full on fewer calories.
The takeaway
Protein is not a magic fat-burner, but it is the single most useful thing to get right when losing weight — it keeps you full and keeps your muscle. Aim for 1.2 to 1.6 grams per kilogram of body weight, include a protein source in every meal, and let the rest of your plate be vegetables and whole foods.
Protein is one key piece of a complete approach. If you want the full system — how much to eat, what fills you up, and how to keep the weight off for good — that is exactly what The Lean Method lays out, step by step.