Flexitarian: vegetarian with a loophole. And the loophole is the point.
Mostly plants, sometimes meat, no labels to defend at dinner parties. It sounds like a diet for people who can't commit. It's actually the version most people can keep up for life.
The short version
- What it is
- A mostly vegetarian diet with meat or fish now and then. No fixed rules.
- Good for
- Getting most of the benefits of plant-heavy eating without giving anything up for good. Easy on the planet too.
- Bad at
- Being specific. "Occasional meat" can quietly turn into "meat every day except Tuesday".
- Evidence
- Weak to moderate. Few studies on flexitarians as such; strong logic from related research.
- Our take
- Probably the most realistic diet in this whole list. We make the "sometimes" concrete.
What the flexitarian diet actually is
The word is "flexible" glued to "vegetarian". A flexitarian eats mostly plant foods and adds meat or fish occasionally. A review of the research defines it exactly that way: primarily, but not strictly, vegetarian.1
There's no official rulebook, no counting, no certificate. Some people go meat-free on weekdays. Some eat meat only when they're out. Some keep fish and drop the rest. If you've ever said "I'm trying to eat less meat", you're basically a flexitarian already, you just didn't have the T-shirt.
It overlaps with being reducetarian, which simply means eating less meat than before. Flexitarian usually goes a step further: plants are the default, meat is the exception.
How it works in your body
There's nothing mysterious here. Every meal where beans, lentils, tofu or eggs replace meat tends to bring more fibre and less saturated fat. Over weeks, that nudges cholesterol, blood pressure and weight in the right direction. The trials on fully vegetarian diets show what happens at the far end of that dial: lower LDL cholesterol and a couple of kilos of extra weight loss.23 Flexitarian sits somewhere in between.
The other half of the trick is which meat goes first. Processed meat is the one with the clearest evidence of harm. The WHO's cancer agency classifies it as a cause of bowel cancer, with risk rising about 18% for every 50 g eaten daily, roughly two slices of ham .4 Red meat is rated "probably" carcinogenic. Swap the sausages for beans first, and you get the biggest win for the least sacrifice.
What you eat, what you don't
Eat
- Beans, lentils, chickpeas, tofu, tempeh, most days
- Eggs, natural yoghurt, some cheese
- Vegetables at every meal, fruit, whole grains
- Nuts and seeds
- Fish, especially oily fish, once or twice a week
- Chicken or lean red meat, in small portions, a few times a week at most
Forget it
- Processed meat: sausages, ham, salami, bacon as a habit
- Meat at every meal "because it's only a bit"
- Soft drinks, sweets, white bread
- Ultra-processed plant burgers as the main replacement
- Fast food as your "occasional meat"
Alcohol on a flexitarian diet
OK, now and then
- A glass of dry wine with a meal
- Spirits neat or with soda water and lime
- One beer at the barbecue
Not worth it
- Sweet cocktails, liqueurs, alcopops
- Rounds of beer with a plate of sausages
- Drinking on an empty stomach
50 Club: one beer or a small glass of wine at the weekend barbecue.
Being flexible with meat doesn't mean being flexible with drink. The World Health Organization says no safe level of alcohol has been shown.7 All the details are in our alcohol guide.
What it's good for, with proof
Early signs of better health
A review of 25 studies on flexitarian eating found emerging evidence of benefits for body weight, metabolic health and blood pressure.1 "Emerging" is the honest word. Most of the studies were observational, and only four were trials.
Most of what vegetarian diets offer
Fully vegetarian diets lowered LDL cholesterol in 30 randomised trials,2 and in the UK's EPIC-Oxford study vegetarians had 22% less heart disease and fish eaters 13% less than meat eaters.5 Flexitarians weren't studied separately, so we can't promise the same numbers. But the direction is clear: less meat, more plants, better results.
A diet the planet can afford
The EAT-Lancet Commission, 37 experts from 16 countries, designed a "planetary health diet" that feeds people well within the planet's limits. It's essentially flexitarian: plant protein as the base, with an average of about 14 g of red meat a day, roughly one burger a week .6 And a huge analysis of food production found that even the lowest-impact animal products usually have a bigger environmental footprint than plant alternatives.8
The uncomfortable truth
"Plant-based burgers make flexitarian easy." They make it easy to stay in fast food. A burger with a plant patty, white bun and fries is still a burger, white bun and fries. Beans, lentils and tofu are the real swap.
"Flexitarian is proven to make you healthier." Not as such. The research on flexitarians specifically is thin and mostly observational.1 What we have is strong evidence that processed meat harms and plant-heavy patterns help. Flexitarian is a sensible way to use that, not a proven diet in its own right.
The risks
- Drift. No rules means it's easy to slide back to meat every day. Plan your meat days in advance.
- Low iron. If red meat drops out completely and plant sources don't replace it, iron can run low, especially with heavy periods. Lentils, beans and greens with vitamin C help.
- Swapping meat for junk. Cheese toasties, vegan nuggets and crisps don't count as plants.
- "Occasional" processed meat. The bowel cancer risk scales with how much you eat.4 Keep it a rare treat, not a weekly staple.
Allergies: watch the staples
When meat steps back, soy, nuts, eggs and dairy often step forward. All of them are major allergens.
| Staple | Allergen (EU list of 14)9 | Swap |
|---|---|---|
| Tofu, tempeh, soy drink | Soy | Lentils, beans, eggs |
| Eggs | Eggs | Tofu (if no soy allergy), chickpea-flour pancakes |
| Cheese, yoghurt, milk | Milk | Fortified oat drink, beans, fish |
| Nuts, nut butters | Tree nuts, peanuts | Pumpkin and sunflower seeds |
| Hummus, tahini | Sesame | White bean dip with olive oil |
| Fish and seafood on meat days | Fish, crustaceans, molluscs | Chicken, eggs, legumes |
| Seitan, wholegrain pasta, bread | Cereals containing gluten | Rice, quinoa, potatoes |
Don't go flexitarian if you…
- have iron-deficiency anaemia, without a plan from your doctor
- have ever had an eating disorder and use "less meat" as a way to eat less overall
- have a kidney condition where your doctor has set specific protein or potassium limits
Healthen me asks about all of these and gives you a different plan if any apply.
How we use flexitarian in your plan
Flexitarian is a filter you pick in Healthen me, and we make it specific. You tell us how many meat days you want; the engine fills the rest with legumes, eggs, tofu and fish, and checks your protein, iron and B12 every week.
Processed meat is always in the red zone. Red meat is yellow: fine, sometimes. Fish counts as your best "meat day". Your fast-breaking meal stays low-carb, like eggs with greens or beans with avocado, and the rest of the day follows the Mediterranean pattern.
Ready to go further? The vegetarian filter is one click away. Not ready? Fine. Half in beats out.
This article is general information, not medical advice. If you have a medical condition or take medication, talk to your doctor before changing how you eat.
Sources
- Derbyshire EJ. Flexitarian diets and health: a review of the evidence-based literature. Frontiers in Nutrition 2017;3:55. doi.org/10.3389/fnut.2016.00055
- Koch CA, Kjeldsen EW, Frikke-Schmidt R. Vegetarian or vegan diets and blood lipids: a meta-analysis of randomized trials. European Heart Journal 2023. doi.org/10.1093/eurheartj/ehad211
- Huang RY, Huang CC, Hu FB, Chavarro JE. Vegetarian diets and weight reduction: a meta-analysis of randomized controlled trials. Journal of General Internal Medicine 2016;31(1):109–116. doi.org/10.1007/s11606-015-3390-7
- Bouvard V et al. Carcinogenicity of consumption of red and processed meat. The Lancet Oncology 2015. doi.org/10.1016/S1470-2045(15)00444-1
- Tong TYN et al. Risks of ischaemic heart disease and stroke in meat eaters, fish eaters, and vegetarians over 18 years of follow-up: results from the prospective EPIC-Oxford study. BMJ 2019;366:l4897. doi.org/10.1136/bmj.l4897
- Willett W et al. Food in the Anthropocene: the EAT–Lancet Commission on healthy diets from sustainable food systems. The Lancet 2019;393(10170):447–492. doi.org/10.1016/S0140-6736(18)31788-4
- WHO Regional Office for Europe. No level of alcohol consumption is safe for our health. News release, 4 January 2023. who.int/europe/news/item/04-01-2023-no-level-of-alcohol-consumption-is-safe-for-our-health
- Poore J, Nemecek T. Reducing food's environmental impacts through producers and consumers. Science 2018;360(6392):987–992. doi.org/10.1126/science.aaq0216
- Regulation (EU) No 1169/2011 on food information to consumers, Annex II (the 14 allergens). eur-lex.europa.eu/eli/reg/2011/1169/oj