How much protein you really need (and how to get there without tubs or strange powders)

Protein is the number one question on the gym floor, and it's also the second, the third, and the fifth. How much do I need, do I have to supplement, and if I eat more will I build muscle faster? Look online and you'll find answers that are either too vague ("eat enough protein") or too technical ("1.6 grams per kilo of lean mass adjusted for activity level"), and neither kind of answer helps you when you're standing in front of a shopping cart on a Wednesday afternoon.

What follows is a direct answer. Real numbers, real food from any supermarket, and three full day examples you can copy exactly as they are. Finish this and the protein question stops being a problem for the rest of your life.

The number one question on the gym floor

Someone comes in for a first session, and a week later they're back with the question: how much protein do I have to eat? It's the right question, because protein is the only macronutrient your body doesn't store. Carbohydrates are stored in the muscles and the liver as glycogen, and fat is stored in adipose tissue, rather too well in fact. Protein isn't stored anywhere. Eat too little of it on a given day and your body takes what it needs from the muscle you already have.

That matters most when you train for strength. Every session creates small amounts of microdamage in the muscle, which the body repairs and, if there's enough material available, rebuilds slightly stronger, and the material in question is protein. Without it, training only breaks you down; it doesn't build you back up.

Why grams per kilo change with age

Official recommendations put the figure at 0.8 grams per kilo of body weight per day, which exists to avoid clinical deficiency, not to keep you healthy and certainly not to build muscle. It's the minimum that keeps you from getting sick, not the optimum that makes you feel good.

The numbers used in the serious scientific literature for active adults look very different. Researchers put the range at 1.2 to 1.6 grams per kilo for maintaining and improving body composition in adults who train regularly. From age 50 onward that rises to 1.4 to 1.8 grams per kilo, because of something called anabolic resistance, meaning the body gets less efficient at using protein to build muscle.

In real numbers: a person of 70 kg who trains three times a week should be eating between 85 and 115 grams of protein a day, a person of 85 kg between 105 and 140 g, and a woman of 60 kg going through menopause between 85 and 110 g. Those numbers don't happen by accident. They have to be planned.

Work out yours in 30 seconds

Do this now rather than later: take your weight in kilos and multiply it by 1.4. That's your daily protein floor, and here's how to fine tune it.

If you're under 40, not in menopause, and training regularly, keep the multiplier at 1.4. Raise it to 1.6 if you're trying to lose weight and eating in a calorie deficit, since protein is what protects you from losing muscle, raise it to 1.7 if you're in menopause or a man over 50, and go to 1.8 if you're a serious athlete or you train five or six days a week.

Example: a woman of 65 kg, 48 years old, doing strength training two days a week and in early menopause. 65 x 1.7 = 110 g of protein a day, and that's her number.

Example: a man of 85 kg, 55 years old, doing strength training three days a week plus two long walks, gives 85 x 1.7 = 145 g a day.

Example: a woman of 58 kg, 35 years old, doing strength training four days a week, gives 58 x 1.6 = 93 g a day.

Four meals, four real examples

Here's an idea that has changed. For years the line was that a single meal can only use 30 to 45 grams of protein and that the rest goes to waste, but that ceiling doesn't exist. The review that tested it in young adults on a structured strength programme found no per-meal absorption limit. In a trial published in Cell Reports Medicine in 2023, researchers compared 25 and 100 grams of protein after training, and the 100 grams produced a bigger and longer anabolic response, with no limit on how much was used.

So why spread it out at all? Convenience, and the fact that it keeps you fuller, not because the rest is lost. Eating a whole day's protein in one sitting is uncomfortable and leaves you hungry for the rest of the day, so split it across three or four servings. To reach 100 to 120 g a day, the typical split is 30 at breakfast, 35 to 40 at lunch, 35 to 40 at dinner, and, if you need it, an afternoon snack with 10 to 15 more.

Real breakfast (30 g of protein)

Option 1: two scrambled eggs (12 g) plus 200 g of plain Greek yogurt with no added sugar (20 g), one slice of whole grain toast with tomato, and coffee or tea. Total: 32 g, and 7 minutes of your time.

Option 2: an omelet made with two egg whites and one whole egg (16 g), 100 g of smoked salmon (15 g), and a slice of toast, which comes to a total of 31 g.

Option 3 (express, for when you're in a rush): a shake with 30 g of whey protein powder, 200 ml of semi skimmed milk, and a banana, which is 32 g in 2 minutes. Use this one for when you have no time, not as a replacement for every breakfast.

If your breakfast has no protein in it at all, coffee and toast with olive oil, say, or cereal with milk, you start the day on 5 to 10 g and you never catch up, which is why breakfast is the meal most worth checking.

Real lunch (35 to 40 g of protein)

Option 1: 150 g of grilled chicken breast (40 g) with half a plate of salad with avocado, tomato, and walnuts, plus a quarter of a plate of rice, quinoa, or boiled potato, for a total of 40 g.

Option 2: 150 g of baked hake (35 g) with sauteed vegetables and half a plate of legumes, which adds another 10 g, for a total of 45 g.

Option 3: 100 g of drained canned tuna in water (25 g) with a full salad, 50 g of fresh soft cheese (6 g), and whole grain bread, for a total of 31 g. If you're in menopause, add a boiled egg on top and you reach 37 g.

Option 4 (vegetarian): 200 g of firm tofu (30 g) with 100 g of cooked lentils (9 g) and roasted vegetables, for a total of 39 g.

A dinner that actually delivers (30 g of protein)

Dinner is another place where it's easy to fall short. The typical casual dinner, toast with cheese, some cured meat, a salad, a bit of bread, usually delivers 10 to 15 g of protein. That's a long way off the mark.

Option 1: 150 g of baked salmon (30 g) with roasted vegetables and hummus, for a total of 32 g.

Option 2: 150 g of grilled turkey breast (35 g) with a salad, a boiled egg (6 g), and avocado, for a total of 41 g.

Option 3: two fried eggs (12 g), 80 g of fresh cheese (10 g), and 100 g of tuna (14 g) mixed in a bowl with vegetables, for a total of 36 g.

Option 4 (light but enough): 200 g of plain Greek yogurt (20 g), 40 g of almonds (8 g), and fruit, for a total of 28 g. Having only this for dinner several days running isn't ideal, but now and then it works fine.

Rescue snack (10 to 15 g of protein)

If you eat three meals and still struggle to reach 100 g, add a snack in the middle of the afternoon. The quick options are easy enough. A plain Greek yogurt, a slice of turkey rolled around cheese, a handful of almonds with a piece of cheese, a coffee with whole milk and two boiled eggs, or a glass of kefir with whey protein stirred into it.

What about shakes? When yes, when no

Protein powder isn't essential for anybody; it's a convenience tool. It makes sense to use it in these situations.

You have no time to eat breakfast at home and you'd rather drink a shake in the car than have nothing at all, or you've just trained, you're hungry, and a real meal is still 45 minutes away. You travel for work and have no control over hotel food. You're vegetarian or vegan, and hitting your daily protein on food alone is hard work.

In all of those cases a whey protein shake with 25 to 30 g per scoop is useful. Buy a brand with a short ingredient list, whey protein concentrate or isolate plus some sweetener and nothing else, and be suspicious of products with 20 ingredients, odd colorings, and promises of "fat burning". Protein doesn't have to do anything other than be protein.

Don't reach for a shake when you can eat real food. Food brings vitamins, minerals, fiber, and nutrients that the powder doesn't have, which is why a salmon fillet and a scoop of powder with the same number of grams of protein aren't equivalent as far as your body is concerned. The salmon wins every time.

Vegetarian or vegan: how to get there without suffering

It can be done. It isn't as convenient as it is with meat and fish, but it's perfectly viable. There are two keys: combine your sources, and eat slightly larger volumes.

The main sources are firm tofu (20 g per 100 g), tempeh (19 g per 100 g), seitan (25 g per 100 g), lentils (9 g per 100 g cooked), chickpeas (8 g per 100 g), edamame (11 g per 100 g), and quinoa (4.4 g per 100 g). Add eggs and dairy to that list if you're ovo lacto vegetarian.

The usual problem for vegetarians is that plant sources carry less protein per gram than meat does. Reaching 40 g with lentils means eating 450 g of cooked lentils, which is a generous plate, where chicken gets you there with 150 g. It takes more planning, but it's doable, and if you're strictly vegan, a pea or rice protein powder helps close the afternoon gap.

Typical mistakes I see every week

Mistake 1: thinking that eating a lot of protein will "make you big". It won't. Eating enough protein for the training you do gives you the material to rebuild what you break down, and the body uses whatever is left over as energy or gets rid of it, which is why 30 g more a day doesn't turn you into the Hulk.

Mistake 2: thinking protein damages your kidneys. In people with healthy kidneys, intakes of 1.5 to 2 g per kilo have no adverse effects documented anywhere in the scientific literature. The exception is people with pre existing kidney disease, who should talk to their doctor; for everybody else this is a myth that doesn't hold up.

Mistake 3: drinking the shake and thinking "I have had breakfast". A shake isn't a meal, it's a vehicle for protein, and a meal has protein plus some carbohydrate plus fat plus micronutrients. Drink only the shake and by mid morning you'll be hungry and low on energy.

Mistake 4: counting the protein in bread, pasta, or brown rice toward your total. Those foods give you 3 to 8 g per serving, poorly digestible and with incomplete amino acids, so eat them if you like, but don't count them as serious protein.

Mistake 5: eating all your protein at dinner. Your body will use the 80 g you cram in at night after a breakfast and a lunch of 10 g each, but you'll have spent the whole day hungry and performing worse, so always spread it across 3 to 4 servings.

Mistake 6: believing that only athletes need a lot of protein. Anybody over 40 benefits from at least 1.2 g per kilo a day whether they train or not, and from 60 onward, 1.5 g per kilo is a common recommendation for slowing down sarcopenia, the muscle loss that comes with age.

Your shopping list for the week

For one adult, this weekly list covers around 100 g of protein a day for seven days, with variety. The budget is reasonable too, between 35 and 50 euros depending on where you shop.

Animal proteins: 6 large eggs, 600 g of chicken breast, 400 g of white fish (hake, cod), 300 g of fresh salmon, 2 cans of tuna in water, 400 g of turkey or lean beef, and 200 g of smoked salmon.

Dairy: 1 kilo of plain Greek yogurt with no added sugar, 500 g of fresh soft cheese or cottage cheese, and 1 liter of semi skimmed milk or kefir.

Legumes: 1 jar of cooked lentils, 1 jar of cooked chickpeas, and frozen edamame.

Extras: avocados, unsalted almonds, extra virgin olive oil, assorted vegetables (whatever you like), whole grain or rye bread, brown rice or quinoa, and potato or sweet potato.

Optional: 1 tub of whey protein, which lasts 20 to 30 days, for the days when you're in a rush.

With this list you can plan three meals a day for a whole week. You won't have to think much about it, and you won't go over budget.

Protein before, during or after training

Here's another question that comes up every week: when do I have to take the protein? The short answer is disappointing, because it hardly matters at all. The 30-minute anabolic window that the bodybuilding magazines wrote about in the nineties stopped holding up in the scientific literature years ago, and what counts is the daily total, not the exact timing.

That said, two practices do help a little. The first is to eat something with protein in the 2 hours before training; you don't need to stuff yourself, but showing up at the gym after 4 hours without food, on an empty stomach, makes the session go worse. Greek yogurt with nuts, or a boiled egg with a slice of toast, is plenty.

The second is to eat a complete meal with 30 to 40 g of protein in the 2 to 3 hours after training, not because the muscle will "go cold" if you take longer, but because you're hungry and low on energy afterward, and without a plan you end up eating whatever is within reach. A real post workout meal is part of the plan, not an extra.

Training very early on an empty stomach, at 6:30 before work, is fine, but make sure your first meal of the day isn't at 12:00, and eat something within the first hour after you finish the session.

Protein when you want to lose weight

This one is critical. When you eat in a calorie deficit to lose fat, your body has two candidates for covering the energy gap, fat tissue, which is what you want to lose, and muscle tissue, which is what you want to keep, and if you aren't eating enough protein it pulls from muscle very easily, because muscle costs more to maintain than fat does.

The fix is simple: in a calorie deficit, raise your protein to 1.8 to 2.0 grams per kilo. That high bracket comes from reviewing the studies run with strength-trained athletes who were already lean and eating in a calorie deficit, which is exactly the setting where most muscle is at stake. That's a high amount, but it does two jobs at once. It protects muscle while you lose weight, and because protein is far more filling than carbohydrates or fats, eating more of it makes the deficit much easier to live with. If you're always hungry on a low protein diet, raising it is one of the first things worth trying.

If you weigh 70 kg and you want to lose fat, your target is somewhere around 130 to 140 g of protein a day. Cut carbohydrates and fats, keep protein high, and that's the combination that works for holding on to muscle in a deficit.

When to suspect you are not eating enough

There are physical and performance signals that warn you when you're running low on protein, even if you never count a gram. Learn them. They work as a decent radar.

First signal: three months of hard training and you aren't getting any stronger, still lifting the same weight. If your diet were in order, even roughly, you'd be progressing. When the progress doesn't come, one of the first things to check is whether the material is missing.

Second signal: soreness that takes four or five days to fade, which points to slow recovery. Age can play a part, and so can not having enough protein to repair the damage training does to you.

Third signal: you can't stop snacking between meals and you feel hungry all day long. Protein is filling, so when you fall short your body asks for food constantly.

Fourth signal: brittle nails and more hair falling out than usual. Both structures are made of protein, specifically keratin, and when the body has to prioritize, it prioritizes vital organs over nails and hair. Those two failing first is one of the earliest warnings you get.

Fifth signal: you struggle to keep your body temperature up, with chronically cold hands and feet even in spring. Metabolism drops when protein is missing, and the body conserves energy by lowering peripheral temperature.

A sample week for a woman of 65 kg

To show you that 110 g a day is achievable on normal food, here are three different days, all of it built from products you can buy in any supermarket.

Day 1. Breakfast: 2 scrambled eggs, 1 plain Greek yogurt (150 g), and whole grain toast (35 g of protein). Lunch: a large salad with 150 g of grilled chicken, avocado, walnuts, and fresh cheese (45 g), and then dinner is 150 g of baked salmon with vegetables (30 g). Day total: 110 g.

Day 2. Breakfast: 200 g of Greek yogurt with almonds and fruit (25 g). Lunch: 200 g of lentils with 100 g of canned tuna in water and vegetables (35 g), with a snack of 1 boiled egg and whole grain bread (10 g). Dinner: 150 g of turkey breast with salad (40 g), for a day total of 110 g.

Day 3 (faster). Express breakfast: a shake with 30 g of whey protein in 300 ml of semi skimmed milk and a banana (38 g). Lunch: a plain omelet with 3 eggs, 50 g of cheese, and salad (28 g), followed by a snack of 100 g of sliced turkey rolled with fresh cheese (18 g). Dinner: 150 g of baked hake with roasted vegetables (32 g), for a day total of 116 g.

None of these days costs more than what you'd normally eat; they're simply built so that enough protein lands in each meal.

The final question: what if I overdo it?

Eat 150 g one day instead of 110 and nothing happens; spend a week below 80 and that's when you start losing ground in the gym. Protein works on weekly consistency, not daily precision, so don't obsess over weighing every food on a scale. Learn to estimate by sight instead: a palm sized portion of meat is around 25 to 30 g of protein, a Greek yogurt is around 15 g, three eggs are around 18 g. Spend two weeks calculating slowly and after that you can do it by eye.

Food alone leaving you short? The supplement aisle comes next: Which protein to buy (and when you do not need any).

And one last detail: protein isn't a diet, and it doesn't switch on and off. It's a way of eating for good. Go back to eating the way you used to and your body goes back to what it was; keep it up for years and your body keeps up too. That simple, and that demanding.

If you have made it this far, the topic clearly hits close to home. When that happens, it sometimes pays to stop improvising and talk to a personal trainer on the Costa del Sol. Not forever, just to start off on the right foot.