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Where the experts disagree

178 questions the people you follow answer differently. Practice never picks a winner: every position is here, with what it rests on and where it came from.

• How much protein do I actually need? 7 positions
• How much protein should I actually eat? 7 positions
• Should you use a research peptide like BPC-157 to heal an injury faster? 7 positions
• Should I fast for 16 hours a day? 6 positions
• How much protein should I eat? 5 positions
• How long should a fast be? 4 positions
• How much salt should you eat? 4 positions
• Should women fast the same way men do? 4 positions
• Do whole grains belong in a healthy diet, or should you cut them out? 3 positions
• How far should I go to get chemicals out of my house? 3 positions
• How far should I go to get plastic out of my house? 3 positions
• How much testing and intervention does a longevity routine actually need? 3 positions
• If my gut is a mess, should I eat more fiber or none at all? 3 positions
• Is a ketogenic diet worth trying, or do its risks outweigh its benefits? 3 positions
• Is it worth paying more for organic produce? 3 positions
• Is obesity caused by too much insulin, or just by too many calories? 3 positions
• Is the black plastic in my kitchen dangerous? 3 positions
• Is there a level of drinking that is good for you, or only levels that are less bad? 3 positions
• Should I bank stem cells now, while mine are the youngest they will ever be? 3 positions
• Should I take creatine after menopause? 3 positions
• After 55, is more protein protective or risky? 2 positions
• Are cold showers and saunas worth doing for your nervous system? 2 positions
• Are seed oils something you should worry about? 2 positions
• Are stem cell treatments getting cheaper as more clinics open? 2 positions
• Are the plastic chemicals in everyday products actually harming me at the doses I get? 2 positions
• Can a ranking of the best diets tell me which one is healthiest? 2 positions
• Can environment design and identity change break a stress-driven habit, or do you have to change the reward? 2 positions
• Can I put my type 2 diabetes into remission with food, and which food? 2 positions
• Can you change your chronotype, or do you have to live with it? 2 positions
• Can you get enough protein from plants alone? 2 positions
• Did Ornish's trials show that a plant-based diet reverses heart disease? 2 positions
• Did the twin study show that going vegan is better, or just that eating less is? 2 positions
• Do adaptogens like ashwagandha actually balance your stress hormones? 2 positions
• Do everyday blood sugar spikes actually age you? 2 positions
• Do everyday low doses of hormone-mimicking chemicals matter, or does the dose still make the poison? 2 positions
• Do I actually need eight hours of sleep? 2 positions
• Do I have to give up animal foods completely? 2 positions
• Do I have to go all the way to vegan, or is adding more plants enough? 2 positions
• Do I need a detox or cleanse protocol? 2 positions
• Do I need to eat plants at all? 2 positions
• Do I need to get rid of my non-stick pans? 2 positions
• Do you have to eat a high-carbohydrate diet to perform in endurance sport? 2 positions
• Does a healthy adult need to eat carbohydrate? 2 positions
• Does a plant-based diet need to be very low in fat, or do nuts, seeds and avocados belong in it? 2 positions
• Does eating less often lower insulin in a way that makes you lose weight? 2 positions
• Does fruit belong in an animal-based diet? 2 positions
• Does how you structure your training programme matter, or just how much you do? 2 positions
• Does it matter how you spread your protein through the day? 2 positions
• Does it matter when I eat, or only how much? 2 positions
• Does it matter whether the sugar in a food is added or naturally there? 2 positions
• Does meditation actually make you happier, or just less anxious? 2 positions
• Does my body need help detoxifying? 2 positions
• Does my pediatrician have a financial reason to push vaccines? 2 positions
• Does your body need help clearing out hormones each month? 2 positions
• For early Alzheimer's disease, should the diet go high fat or very low fat? 2 positions
• For losing weight, does it matter whether I cut fat or cut carbs? 2 positions
• For type 2 diabetes, does a ketogenic diet actually beat a Mediterranean one on blood sugar? 2 positions
• How do you know you are in Zone 2, and does the number matter? 2 positions
• How much protein do you actually need, and does it matter whether it comes from plants or animals? 2 positions
• How much protein should a healthy adult under 65 eat? 2 positions
• If cutting carbs works for me, what is it that's actually working? 2 positions
• If I cut carbs and eat when I'm hungry, will the fat come off on its own? 2 positions
• If I don't have diabetes, is it worth trying to flatten my blood sugar spikes? 2 positions
• If I eat more butter and cheese, is that bad for my heart? 2 positions
• If I eat this way and my cholesterol goes up, does it matter? 2 positions
• If I have insomnia, can I nap? 2 positions
• If I only have a few hours a week, should I train mostly easy and long, or mostly short and hard? 2 positions
• If I switch to an animal-based low-carb diet and just eat when I am hungry, will I end up eating less? 2 positions
• If I used to smoke, should I get the yearly CT scan for lung cancer? 2 positions
• If my brain were preserved, would there still be a person in there to bring back? 2 positions
• If saturated fat isn't the problem, does that mean animal foods are fine? 2 positions
• If you are a woman over 40, how long should you fast? 2 positions
• If you do not have diabetes, is it worth managing your glucose spikes? 2 positions
• If you eat zero carbohydrate, do you still need vitamin C, and does everyone need to go that far? 2 positions
• If you have an autoimmune disease, should you cut out all animal foods or all plant foods? 2 positions
• If you only have a few hours a week for cardio, should most of it be easy Zone 2 work or should it be harder? 2 positions
• If you take exogenous ketones every day, does the formulation matter, and which one? 2 positions
• If you want to lose weight, does it matter how many calories you eat, or only what you eat? 2 positions
• If you want to lose weight, is a very low-fat plant-based diet the one to pick? 2 positions
• Is 'plastic-free' laundry and dishwasher detergent worth paying more for? 2 positions
• Is 'ultra-processed' a useful thing to avoid, or just a label? 2 positions
• Is "ultra-processed food" a category you can actually shop by? 2 positions
• Is a daily glass or two of wine good for you? 2 positions
• Is a detox programme a useful thing to do, or a sign that you should walk away? 2 positions
• Is a restricted daily eating window worth doing? 2 positions
• Is a training programme enough, or does the rest of my day have to change? 2 positions
• Is an all-meat carnivore diet a reasonable thing to try? 2 positions
• Is an injection of my own fat-derived stem cells a drug the FDA gets to regulate? 2 positions
• Is cryopreservation worth paying for? 2 positions
• Is cutting carbs the thing that makes a diet work? 2 positions
• Is it calories, or is it insulin? 2 positions
• Is it OK to exercise in the evening? 2 positions
• Is it worth buying organic produce? 2 positions
• Is it worth tracking my own blood sugar responses to decide what to eat? 2 positions
• Is optimising my lifestyle actually going to make me live much longer, or is that beside the point? 2 positions
• Is petroleum jelly bad for your skin? 2 positions
• Is resveratrol worth taking? 2 positions
• Is saturated fat something I need to worry about? 2 positions
• Is spontaneous desire the standard a healthy long-term relationship should try to restore? 2 positions
• Is sugar the problem, or is it just calories? 2 positions
• Is the 10 percent cap on saturated fat worth following? 2 positions
• Is the bisphenol A in food packaging harmful at the levels people are actually exposed to? 2 positions
• Is the plastic in my food and water doing me harm at the amounts I actually get? 2 positions
• Is there a level of these chemicals low enough to be safe? 2 positions
• Is there a pill that boosts my stem cells? 2 positions
• Is there a test that tells me whether low-carb is right for me? 2 positions
• Is ultra-processed food addictive, or is that the wrong word for it? 2 positions
• Is Zone 2 a special intensity that produces adaptations nothing else can? 2 positions
• My cholesterol came back high. Do I treat the number, or find out why it is high? 2 positions
• My cholesterol went up on this diet. Does it matter? 2 positions
• My gut hurts. Should I eat more fibre or less? 2 positions
• My LDL cholesterol went up on a ketogenic diet. Is that a problem? 2 positions
• On a low-carb diet, do you still need vegetables and fibre? 2 positions
• Once you are past the minimum, does adding more sets keep building muscle? 2 positions
• Should a healthy adult take an NAD booster (NMN or NR) to slow aging? 2 positions
• Should a healthy person without diabetes take metformin to slow ageing? 2 positions
• Should a healthy young adult routinely receive each updated COVID-19 vaccine? 2 positions
• Should families use firm age rules for smartphones and social media? 2 positions
• Should I avoid a food because it's ultra-processed? 2 positions
• Should I avoid the common chemical sunscreen filters and use mineral only? 2 positions
• Should I be adding salt to my food, or cutting it? 2 positions
• Should I be eating nuts, seeds and avocados? 2 positions
• Should I be preparing for my death, or trying to avoid it? 2 positions
• Should I be told what bad sleep is doing to me? 2 positions
• Should I be trying to raise my VO2 max? 2 positions
• Should I choose a mineral sunscreen over a chemical one? 2 positions
• Should I cut out gluten even though I do not have coeliac disease? 2 positions
• Should I get a biological age test? 2 positions
• Should I get a flu shot every year? 2 positions
• Should I have a target weight? 2 positions
• Should I keep protein low to live longer? 2 positions
• Should I optimise my sleep, or stop trying so hard? 2 positions
• Should I pay a clinic for a stem cell treatment? 2 positions
• Should I put back a food because the ingredient list is long or full of words I can't say? 2 positions
• Should I replace my plastic kitchen and personal care items? 2 positions
• Should I skip breakfast? 2 positions
• Should I stop cooking with sunflower, soybean, corn or cottonseed oil? 2 positions
• Should I switch away from my aluminium antiperspirant? 2 positions
• Should I take an NAD booster like NMN? 2 positions
• Should I take hormone therapy to prevent disease, or only to treat symptoms? 2 positions
• Should I take supplements for sleep and workouts, when the person recommending them is paid by supplement companies? 2 positions
• Should I throw out my black plastic kitchen utensils? 2 positions
• Should I time my fasting to the phase of my menstrual cycle? 2 positions
• Should I use a glucose monitor to decide which foods are right for me? 2 positions
• Should nutrition scientists take money from food companies? 2 positions
• Should pregnant women avoid folic acid in favour of methylfolate? 2 positions
• Should the FDA finding that sunscreen chemicals reach your bloodstream change which sunscreen you buy? 2 positions
• Should women plan training around the phase of the menstrual cycle? 2 positions
• Should you add sets every week, or only when your lifts stop improving? 2 positions
• Should you avoid Tylenol in pregnancy? 2 positions
• Should you buy a test that tells you how fast you are ageing? 2 positions
• Should you cook with olive oil, or with no added oil at all? 2 positions
• Should you cook with seed oils, or replace them with olive oil, ghee and tallow? 2 positions
• Should you distrust a study because a company paid for it? 2 positions
• Should you eat more salt or less? 2 positions
• Should you fast for longer than a day? 2 positions
• Should you get your vitamin D level tested, and what number should you aim for? 2 positions
• Should you start hormone therapy in perimenopause to protect your brain, bones and heart, or only to treat symptoms? 2 positions
• Should you stop using chemical sunscreen? 2 positions
• Should you swap butter for vegetable oil? 2 positions
• Should you take an easy week or a week off from training every month or two? 2 positions
• Should you train your back to round under load, or keep a loaded spine stiff? 2 positions
• Should you train your lower back through a rounded, loaded position, or keep the spine stiff whenever it is loaded? 2 positions
• Should you wear sunscreen every day, or cover up and skip it? 2 positions
• Someone I trust goes to a clinic that injects stem cells all over your body in one day. Should I? 2 positions
• There are stem cell clinics everywhere now. Is that access, or is that a problem? 2 positions
• To get stronger, do you need a handful of heavy sets a week or a lot of them? 2 positions
• What makes a new habit stick: repeating it for weeks, or feeling good the moment you do it? 2 positions
• What should an ADHD programme change first: the person or the environment? 2 positions
• What should someone change first when persistent pain has taken over daily life? 2 positions
• When a low-carb diet works for me, what is it that's actually working? 2 positions
• When a rewarding behavior or substance feels out of control, should the first step be abstinence? 2 positions
• When I cut back on processed food and my numbers get better, what is it that's actually working? 2 positions
• When should I stop drinking coffee: the same time as everyone else, or a time that depends on me? 2 positions
• When two coaches say Zone 2, do they mean the same intensity? 2 positions
• When you do not feel like doing the thing, do you push through the misery, or make the thing small enough that you do not have to? 2 positions
• When you need to get down to the floor, should you deep squat or lunge? 2 positions
• Will my insomnia shorten my life? 2 positions