Nutrition Basics: The 6 Rules That Actually Work

Nutrition advice online is a noisy, contradictory mess. One week it’s high-carb, the next it’s no-carb. Someone’s selling a powder for everything. A new “optimal” eating window. A new villain food. A new miracle fruit. The whole landscape is designed to keep you confused enough to keep buying things.

The good news: when you strip away the marketing, the actual basics are boring, simple, and largely unchanged for decades. Get these right and you’ve done about 90% of the job. The other 10% — fine-tuning macros, micro-managing meal timing, debating creatine doses — only matters if the 90% is already in place. Most people are still trying to optimise the 10% while their 90% is in shambles.

Here’s the honest version.

1. Protein at every main meal

This is the single highest-leverage change most adults can make. Protein keeps you full, supports muscle repair after training, has the highest metabolic cost to digest (you burn calories just processing it), and is the macronutrient most of us under-eat by a long way.

The rough target: 1.6 to 2.2 grams of protein per kilogram of bodyweight per day, for active adults. A 70kg adult is looking at roughly 110 to 150 grams a day. That sounds like a lot until you build it into meals.

The simple version: a palm-sized portion at each main meal. Three palm-sized portions across breakfast, lunch and dinner gets most adults close to where they need to be.

What counts:

• Chicken, turkey, lean beef, lean pork, fish (any of it)
• Eggs (3–4 is a normal portion, not a heart attack)
• Greek yoghurt, cottage cheese (high protein, easy)
• Tofu, tempeh, edamame
• Beans, lentils, chickpeas (lower protein per gram, so larger portions)
• A protein shake counts but isn’t magic — it’s just convenient milk powder

If you do one thing from this article: add a palm of protein to your usual breakfast. Most adults eat almost none in the morning and then wonder why they’re ravenous by 11am.

2. Most of your plate from real food

If most of what you eat looks roughly like it did when it came out of the ground or off the animal, you’re winning. Lots of vegetables, some fruit, decent carbs (oats, potatoes, rice, bread), some fats (olive oil, nuts, avocado), and the protein from above.

Highly processed food isn’t poison. The mistake is treating it like it’s either virtuous or evil. It’s neither. It’s just engineered to be eaten in larger quantities than your body needs, and harder to feel good on.

The growing research on ultra-processed food suggests that how much of it you eat matters more than any single ingredient. People given identical-calorie diets eat noticeably more, and feel less satisfied, when the food is ultra-processed. The mechanism isn’t mystical — it’s just that processed food is designed to be overeaten. That’s its job.

The fix isn’t elimination. It’s ratio. Aim for most of your meals to come from a kitchen rather than a packet, most of the time. Don’t make rules you can’t keep.

3. Hydration is boring but it works

Tired in the afternoons? Headachy? Hungrier than you should be? Foggy by 3pm? Half the time, it’s just dehydration. Your body is bad at telling you it needs water — the signal often arrives as hunger or fatigue first, and thirst last.

Rough target: around 2 to 2.5 litres of fluid a day for most adults, more if you train hard or it’s hot. Tea and coffee count (the diuretic effect is overstated). Sugary drinks and alcohol don’t.

The trick isn’t the total — it’s the distribution. Steady intake through the day beats chugging a litre at 6pm and then waking up at 2am needing the loo. Keep a bottle on your desk. Bring one to the gym. It should be empty by the time you leave.

4. Eat around your workouts sensibly

You don’t need a perfectly timed pre-workout meal. You don’t need to hit a 30-minute “anabolic window” afterwards. The internet has spent twenty years inventing problems that the body has never actually had.

The simple version:

• Before training: a small carb-heavy snack 1–2 hours before, if you’re hungry. A banana. A slice of toast with peanut butter. A small bowl of oats. If you’re not hungry, skip it.
• After training: a proper meal with protein and carbs within a few hours. The recovery window is much longer than people think.
• That’s it. The whole “nutrient timing” conversation for most of us.

The exceptions: if you’re training twice a day, or training for a serious event, or in a steep calorie deficit, timing starts to matter more. For the rest of us — the people training 3 to 5 times a week for general fitness, fat loss or muscle — eat enough across the day and the timing details largely sort themselves out.

5. Alcohol is the silent killer of progress

Not in a dramatic way. Just in a quiet, consistent one.

A few drinks in the evening reliably:

• Wrecks the deep sleep that drives recovery
• Increases hunger and cravings the next day
• Reduces protein synthesis (the actual mechanism by which muscle is built)
• Lowers training motivation for 24–48 hours
• Adds liquid calories that almost nobody accounts for

You don’t have to be teetotal. But if your goals matter to you, this is the lever to be honest about. A pattern of three or four drinks several nights a week will quietly undo a lot of what your training is trying to build.

The realistic version for most adults: one or two nights a week with drinks, rather than five. If that feels hard, it’s worth knowing.

6. Consistency, not perfection

The all-or-nothing approach is what causes Sunday-night despair and Monday-morning detoxes. People eat “clean” for four days, break the rules at the weekend, declare themselves a failure, and start over the following Monday. The cycle gets less efficient every time.

Aim to eat well around 80% of the time and enjoy yourself the rest. That ratio is sustainable for the rest of your life. “Perfect” isn’t sustainable for a fortnight.

What 80/20 looks like in practice: across roughly 21 meals a week, 17 are mostly home-cooked, protein-led, real-food meals. The other 4 are takeaway, restaurant, social dinners, or whatever you genuinely enjoy. Nothing is “cheating.” Nothing is “off plan.” It’s just food.

What about supplements?

The honest answer: most people don’t need many. The supplements industry is worth tens of billions because it’s extraordinarily good at marketing, not because most of its products do much.

The few that have decent evidence and are genuinely worth considering for most adults:

• Vitamin D — especially in winter in the UK. The NHS officially recommends supplementing October to March.
• Creatine monohydrate — the most-studied performance supplement ever. 3–5g a day, cheap, well-tolerated, modest but real benefit for strength training. Also early evidence for cognitive function.
• Protein powder — not a supplement, just convenient food. Useful if you struggle to hit protein targets from meals alone.
• Omega-3 (fish oil) — if you don’t eat oily fish regularly.

Almost everything else — fat burners, detoxes, multivitamins, BCAAs, magic mushroom powders, anti-inflammatory blends — ranges from “does very little” to “literally nothing.” If a supplement claims to do something dramatic, it almost certainly doesn’t.

The myths to ignore

Things that are still being repeated in 2026 that you can safely retire:

• “Carbs make you fat.” Calories make you fat. Carbs are calories. So are fats and protein. If you’re in a calorie deficit, the macronutrient split has very little effect on fat loss.
• “Eating fat makes you fat.” See above. Dietary fat is calorie-dense, but it’s also extraordinarily satiating. Olive oil, nuts, avocado, fatty fish — all fine, all useful.
• “Eating after 7pm causes weight gain.” The body doesn’t have a clock that switches calorie storage on at sundown. Total daily intake matters; timing is mostly irrelevant for fat gain.
• “You need to eat six small meals a day.” You don’t. Two, three, four or five meals all work. Pick what fits your life.
• “Detoxes clean out your system.” Your liver and kidneys do that. They’ve been doing it your whole life. They don’t need a juice cleanse.
• “Gluten is bad for everyone.” Unless you’re coeliac or have a confirmed sensitivity, it isn’t. The fashion has moved on. Bread is fine.

What a sensible day actually looks like

To make this concrete, here’s a normal day’s eating for an active adult who’s training a few times a week. Nothing fancy. Nothing photographed.

• Breakfast: 3 eggs scrambled with spinach, slice of wholegrain toast, a coffee.
• Mid-morning (optional): Greek yoghurt with berries, or an apple with peanut butter.
• Lunch: Chicken or salmon salad with mixed leaves, olive oil, half an avocado, a bread roll if you’re hungry.
• Pre-workout snack: Banana, or a small bowl of oats with honey.
• Dinner (post-workout): Lean mince bolognese with wholemeal pasta and a side salad. Or chicken stir-fry with rice. Or salmon with roast potatoes and broccoli.
• Through the day: 2–2.5 litres of water, a couple of cups of tea or coffee, no alcohol.

That’s it. Protein at every meal. Real food most of the time. Hydration through the day. No drama. No counting. No guilt.

Pair it with proper training

Nutrition and training work together, not separately. Eating well without training will improve your health but won’t change your body composition. Training hard without eating well will produce frustrating, slow results. Both, together, are how progress actually happens.

Our Workout Library gives you structured sessions to actually use what you’re eating — full-body strength, conditioning, push/pull/legs splits, beginner plans. Pair it with the six rules above and you’ve got the whole picture.