Why protein matters when you're losing weight
When you're in a calorie deficit, your body will pull energy from fat and muscle alike unless you give it a reason not to. Eating enough protein is that reason. It's the single most useful nutrition habit to pair with a weight loss plan, and it's also one of the easiest to get roughly right without weighing every meal.
What protein does for you in a calorie deficit
Three things, mainly. First, it protects your muscle. When calories are short, your body will happily break down muscle tissue for energy and spare parts; a steady protein supply (ideally alongside some resistance exercise, even just bodyweight moves) tells it not to. Keeping that muscle means your metabolism stays higher, and it means the weight you lose is mostly the weight you actually wanted to lose.
Second, protein costs more to digest. Your body burns roughly 20 to 30 percent of protein's calories just processing it, compared with far less for carbs and fat. It's not a magic loophole, but over months it's a helpful nudge in the right direction.
Third, and most practically: protein is filling. Meals built around a decent portion of protein blunt hunger for longer than meals built around carbs or fat, and a deficit you're not constantly fighting is a deficit you can sustain. Most diets don't fail because the plan was wrong; they fail because the hunger won.
How much protein do you need to lose weight?
A rough starting point many dietitians suggest is around 1.2–1.6g of protein per kg of body weight per day. For someone weighing 80kg, that works out to roughly 96 to 128g of protein a day. People who train hard, and older adults, often aim a little higher; if you're carrying a lot of extra weight, some professionals prefer to base the target on goal weight rather than current weight so the number stays sensible.
Spreading it across the day works better than cramming it into dinner. Aiming for something in the region of 25 to 40g per meal, including breakfast, gives your body a steady supply to work with rather than one big evening delivery.
Easy ways to hit your protein target
You don't need anything exotic. Chicken and turkey, fish and tinned tuna, eggs, Greek yoghurt, cottage cheese, lean beef and pork, and on the plant side lentils, beans, chickpeas and tofu will all get you there. Small swaps add up quickly: Greek yoghurt instead of regular at breakfast, an extra egg, a tin of tuna through your lunch, a handful of edamame instead of crisps.
And no, you don't need protein shakes. They're a convenience, not a requirement. If a shake is the difference between hitting your number and not, use one; if you can get there with food, food wins on fullness every time.
How to tell if it's working
Not from one weigh-in. Day-to-day scale readings swing with water, sodium and timing, whatever your protein intake is doing. The honest signal is the trend over weeks: that's why a weekly weigh-in beats a daily one, and it's the one thing My Weight Tracker asks of you. Beyond the scale, watch how your clothes fit and whether your strength is holding up; if both are steady while the trend line falls, the protein is doing its job.
This isn't medical advice. Protein needs vary from person to person, and higher intakes aren't right for everyone (particularly if you have a kidney condition). Check with a doctor or registered dietitian for guidance suited to you.