No macronutrient gets argued about like protein. One camp says a gram per pound or you are wasting your time. Another says you barely need any and the whole thing is a supplement-industry invention. Both are wrong, and the honest answer sits in between and is better supported than either. Here is how much protein you actually need, for plain health and for building muscle.

What protein actually does

Protein is the raw material your body rebuilds itself from: muscle, yes, but also enzymes, hormones, and immune cells. It keeps you fuller than carbs or fat for the same calories, which quietly helps with fat loss. And it is the one nutrient that protects your muscle when you are eating less or getting older, which is exactly when your body wants to give that muscle up.

The honest numbers

Forget grams per meal for a second. What matters is your total for the day, set by your bodyweight and your goal.

• The official floor is 0.8 g per kg of bodyweight. That is the RDA, and it is a survival number to prevent deficiency, not a target to thrive on.
• To build muscle, aim for about 1.6 g per kg. The largest analysis of the research found gains from resistance training plateaued at roughly that point, with little extra benefit above it and an upper safety margin around 2.2 g per kg.
• Older adults need more, not less. Ageing muscle resists the signal to grow, so somewhere around 1.2 to 2.0 g per kg helps fight the slow loss that steals your independence.
• Losing fat? Go to the high end, about 2.0 to 2.4 g per kg. More protein in a calorie deficit is what keeps the weight you lose coming from fat and not muscle.

Put in real food terms, for a 75 kg person:

Your goal	Grams per kg	Roughly, for 75 kg
Basic health floor	0.8	60 g
Build muscle	1.6 to 2.2	120 to 165 g
Fat loss, keep muscle	2.0 to 2.4	150 to 180 g
Older, fight muscle loss	1.2 to 2.0	90 to 150 g

Timing matters less than you were told

The “anabolic window” panic is mostly overblown. Hitting your daily total is what moves the needle. That said, spreading it across three or four meals, roughly 0.4 g per kg each, is a little better than one giant hit, because your body can only use so much in one sitting.

Quality counts too. Complete proteins (meat, fish, eggs, dairy) cover all the building blocks. Eat mostly plants? You can absolutely get there, you just need a bit more total and a mix of sources.

Do you need a shake?

Whey powder. Convenient, cheap per serving, and complete. That is all it is. It is food in a tub, not magic, and it does nothing a chicken breast or a tub of Greek yoghurt cannot. Use it if it helps you hit your number on a busy day. Skip it with no guilt if real food gets you there.

What to actually do

Pick the number for your goal, work out your grams, and treat it as the target you build meals around. Put a real protein source in every meal. Then check honestly for a week, because almost everyone who thinks they eat enough protein is eating less than they guess.

Training hard to build muscle as you age, or trying to lose fat without losing yourself? See Strength Training as You Age and Swimming for Fat Loss.

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This is general nutrition education, not medical advice. If you have kidney disease or another health condition, talk to your doctor or a registered dietitian before pushing protein high.