NST topic path

Nutrition

Make sense of fueling, protein, hydration, supplements, and common claims.

Step 1 · Understand

Nutrition research

Rice, skewered meat and vegetables on a dark plate — Illustrative photo · Kamala Bright / Unsplash

Do you need protein right after a workout? The "anabolic window"

Last verified 12 Sept 2026

You do not need to race for a shake after every workout. Research does not establish a universal thirty minute deadline. Daily protein intake is a useful first priority; recent meals and recovery time still matter. Powder is optional.

Are eggs bad for your cholesterol?

Last verified 12 Sept 2026

For most healthy people, no. Up to about one egg a day is not linked to higher heart disease or stroke risk in large studies. Eggs nudge blood LDL up a little, but the net effect is small. The bigger issue is what you eat with them, a fry up is not 'an egg'.

Can you build muscle and lose fat at the same time?

Last verified 12 Sept 2026

Yes, gaining muscle while losing fat is real and documented. It works best for people newer to training or carrying more fat who eat plenty of protein, train hard, and keep any calorie deficit modest. For lean, experienced lifters it is slow, and focused gain then lose phases can be more efficient.

Can you out train a bad diet?

Last verified 12 Sept 2026

For weight, mostly no. Exercise alone shifts about 2 kg on average, less for many; the body partly compensates and total energy burn plateaus, and a session's calories are eaten back fast. Diet sets the deficit. Exercise still matters for keeping weight off and for health regardless of the scale.

Can you spot reduce fat? (Do ab exercises burn belly fat?)

Last verified 12 Sept 2026

No. Two direct randomised trials, one training a single arm, one doing daily ab exercises on a steady diet, both show training a region causes generalised fat loss, not local. Where you lean out first is genetics and sex; visible abs come from lower overall body fat, not crunches.

Can your body only absorb 30g of protein per meal?

Last verified 12 Sept 2026

No. Your gut absorbs almost all of it, just more slowly for a big dose, and the muscle building response keeps rising with larger doses rather than stopping at a set number. What drives muscle gain is total daily protein, about 1.6 g/kg; splitting it across 3 to 4 meals is a habit, not a rule.

Creatine monohydrate: what it does, who it helps, and what it can't do

Last verified 12 Sept 2026

Creatine monohydrate is one of the most studied training supplements. Combined with resistance training it produces a small increase in strength and muscle size, it appears well tolerated in healthy adults, and it is optional rather than essential.

Do fat burner supplements work?

Last verified 12 Sept 2026

Mostly no. 'Fat burner' is a marketing label. Only caffeine has evidence for a small effect, and you can get it from coffee; other ingredients have weak or no support. The stimulant load and rare liver injury risk are real. Fat loss comes from a calorie deficit.

Do light weights tone and heavy weights bulk?

Last verified 12 Sept 2026

No. 'Tone' is not a training style, it is visible muscle at lower body fat. Taken close to failure, light and heavy loads build muscle to a similar degree; heavier loads mainly build strength faster. 'Bulk' takes years of overload and usually a surplus, so it does not happen by accident.

Do you need a pre workout supplement?

Last verified 12 Sept 2026

A pre-workout supplement is not a requirement for training. Evidence about one ingredient or one formula does not establish the value or safety of every blend. This article does not recommend replacing a blend with caffeine tablets or copying research doses.

Do you need BCAA supplements?

Last verified 12 Sept 2026

No. BCAAs are 3 of the 9 essential amino acids and cannot maximise muscle building alone; a review calls the anabolic claim 'unwarranted'. They raise synthesis about 22%, far less than whole protein, and add nothing on top of adequate total protein. For almost everyone they are poor value.

Do you need carbs to build muscle?

Last verified 12 Sept 2026

No. When protein and total calories are adequate, low carb and even ketogenic diets build similar muscle and strength to higher carb diets. Carbs mainly make hard training easier; strict low carb often causes an unintended calorie deficit, and it is the deficit, not the carbs, that costs muscle.

Do you need electrolytes, or is water fine?

Last verified 12 Sept 2026

Electrolyte drinks are not automatically necessary for every workout. Needs depend on the person, exercise and conditions. Both inadequate fluid replacement and excessive drinking can cause harm; this article does not prescribe a personal fluid or sodium target.

Do you need more protein as you get older?

Last verified 12 Sept 2026

Yes, most older adults do. Expert groups recommend about 1.0 to 1.2 g of protein per kg of body weight a day for healthy older people, above the 0.8 g/kg adult reference, because ageing muscle responds less to protein. Resistance training is what makes the extra count. Protein type matters little.

Do you need to eat breakfast?

Last verified 12 Sept 2026

For adults, no, and it is not 'the most important meal' for weight. Trials show adding breakfast doesn't aid weight loss (slightly the opposite), skipping it doesn't slow your metabolism, and the observational skipping obesity link is weak and confounded. Eat it or skip it by hunger.

Do you need to eat every 3 hours? (Does meal frequency matter?)

Last verified 12 Sept 2026

No. At matched calories, meal frequency does not change body composition (a pooled analysis's apparent benefit rested on one study) or metabolic rate, and one missed meal is not 'starvation mode'. Total daily calories and protein are what matter; protein over 3 to 4 feedings is a minor tweak.

Does alcohol kill your gains?

Last verified 12 Sept 2026

Heavy drinking right after training is the clear negative: a large dose cut muscle protein synthesis about 24 to 37%. Over a training block, strength looks mostly unchanged but hormone and synthesis markers drop. An occasional modest drink away from training matters far less. Not drinking advice.

Does caffeine dehydrate you?

Last verified 12 Sept 2026

Not meaningfully. Caffeine is a mild diuretic only at large doses and mainly in people not used to it, and the roughly 100 mL of extra urine is far less than the fluid in the drink. Regular drinkers are tolerant, exercise cancels the effect, and caffeinated drinks count towards your daily fluid.

Does caffeine actually help your training?

Last verified 12 Sept 2026

Caffeine can affect training performance, but it is optional and responses vary. Research doses are not instructions to copy. This article explains the evidence, sleep trade-offs and safety considerations.

Does creatine cause hair loss?

Last verified 12 Sept 2026

Probably not. The worry comes from one 2009 study that measured a DHT rise after creatine loading and never looked at hair. The only trial to directly measure hair follicle health, a 12 week RCT in 2025, found no effect on hormones or hair. Limits remain: one short study in young men.

Does creatine make you bloated?

Last verified 12 Sept 2026

Creatine adds a little water, often about 1 to 2 kg early, less without a loading phase, but it goes inside the muscle cells, not the layer under the skin. A controlled trial found extracellular water rose no more than with placebo. It is water in muscle, not fat, and it reverses if you stop.

Does eating fat make you fat?

Last verified 12 Sept 2026

Not directly. You gain body fat from a sustained calorie surplus, whatever the source. Low fat and higher fat diets lose similar weight head to head. Fat is calorie dense, so fatty foods are easy to overeat, a portion issue, not conversion.

Does eating late at night make you gain fat?

Last verified 12 Sept 2026

Not by the clock. A controlled crossover found meal timing does not change 24 hour energy expenditure; late food is not 'stored as fat' by a switch. The link to weight gain is mostly behavioural: extra unplanned snacking on top of the day, and worse sleep from heavy late meals.

Does menopause change how you should train?

Last verified 12 Sept 2026

Resistance and aerobic exercise remain relevant after menopause, but bone-loading advice needs context. Supervised trials are not home exercise prescriptions, and bone-density findings are not guarantees about fractures.

How much protein do you actually need to build muscle?

Last verified 12 Sept 2026

More protein helps you build muscle from training, up to a point. Pooled analysis puts that point at roughly 1.6 g per kg of bodyweight per day, with wide individual variation. You can usually reach it from food; a supplement is a convenience, not a requirement.

How much water should you drink a day?

Last verified 12 Sept 2026

Daily water guidance is not a personal prescription. Understand the difference between drinks and total water, and why thirst or urine colour alone cannot prove adequate hydration.

Is a continuous glucose monitor worth it if you don't have diabetes?

Last verified 12 Sept 2026

For most people without diabetes, no. A CGM is a medical device. In healthy people the readings run high, and the bias changes by person and by food, so the personalised food rankings the apps sell can mislead. There is little evidence that watching your curves improves health.

Is a collagen supplement worth it?

Last verified 12 Sept 2026

The cited studies give mixed findings on tendon adaptation in healthy young men. They do not establish that collagen treats joint pain or helps an injured tendon recover.

Is beta alanine worth it?

Last verified 12 Sept 2026

Beta alanine may help some demanding exercise tasks, but the size and relevance of the benefit depend on the test. An average effect size is not a promised percentage improvement in your performance.

Is citrulline malate worth it?

Last verified 12 Sept 2026

Marginal and uncertain. One review has a dose before training adding about three reps across a session. Another found no effect on strength, and a third flags results that do not agree, plus label problems in some products. A cheap experiment, not a reliable aid.

Is creatine safe for your kidneys?

Last verified 12 Sept 2026

The cited short trials provide reassurance for the populations and protocols studied, not a guarantee for every reader. Creatine can influence creatinine-based kidney estimates, but that does not establish why an individual result is abnormal. Do not dismiss a raised creatinine or lower eGFR as a supplement effect without clinical assessment.

Is fasted cardio better for fat loss?

Last verified 12 Sept 2026

No. Two randomised trials (4 and 12 weeks) found the same fat loss whether cardio was done fasted or fed at matched calories. Training fasted shifts fuel use towards fat in the session, but the body rebalances afterwards and total energy deficit decides fat loss. Do whichever you can sustain.

Is protein powder worth it, and which type should you get?

Last verified 12 Sept 2026

A powder is a convenience, not a requirement: it adds only a little to training gains once your daily protein is already adequate from food. Type matters little at matched protein per serving, whey concentrate for value, isolate for low lactose, soy or a pea rice blend if you avoid dairy.

Is tart cherry juice worth it?

Last verified 12 Sept 2026

Worth it for one job: recovering fast between efforts over a few days, like a tournament or race block. Pooled studies show a small drop in soreness and a moderate lift in strength and power recovery. Taken daily it may blunt training adaptation, and the juice brings sugar and cost.

Is the "fat burning zone" real?

Last verified 12 Sept 2026

Half real. You burn a higher proportion of fat at low intensity (the 'Fatmax' peak) but not more total fat, and higher intensity burns more calories per minute. Fat loss over weeks tracks the total energy deficit, not the session fuel mix. The machine 'fat burn' light is a rough estimate.

Is walking after a meal good for you?

Last verified 12 Sept 2026

Yes. A pooled analysis of crossover trials found a short, easy walk after eating lowers the after a meal blood sugar and insulin rise. Roughly 10 to 30 minutes, started within about 15 minutes of finishing; it need not be brisk. In type 2 diabetes, a walk after each meal beats one longer daily walk.

Step 2 · Apply

Nutrition guides

No reviewed nutrition guides are published yet. Research remains the starting point.

Step 3 · Compare

Nutrition comparisons

Creatine monohydrate powders compared

Last verified 20 Sept 2026

A contextual comparison of 3 exact products already assessed by North Star Theory. It compares intended use, verified facts and limitations without claiming a universal winner or hands-on test.

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How evidence is assessed