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Low UPF diet - to think the experts weren’t lying?

382 replies

AusBoundDD · 06/05/2025 21:03

Nearly 6 months ago I made it my New Year’s resolution to start eating a low UPF diet in hopes of losing some weight for a once in a lifetime trip, alongside just being healthier in general. Honestly it has been life changing! I’ve lost nearly 10kg without really having to think about it - no restricting or anything like that and in general I just feel so much better. UPFs like crisps, ready meals, even basic supermarket bread don’t feel like ‘real’ food anymore and no longer appeal. On the occasion that I do choose to eat something UPF (which for me is no big deal, im not strict!) it just isn’t as enjoyable as it used to be. I’d choose some sourdough over a loaf of Hovis any day when previously I used to hate it! I feel much fuller + satisfied for longer and rarely get the urge to snack.

Obviously it has its downsides - much less convenience food so cooking takes longer (PITA when doing lunch/dinner prep after a long day at work!), ingredients are more expensive so my shopping bill has gone up but all in all it’s a decision I don’t regret. Honestly I think that this way of eating should be the future.

Anyone else feel this way?

OP posts:
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TheCountessofFitzdotterel · 09/05/2025 22:50

NattyTurtle59 · 09/05/2025 22:14

I'm getting sick of this, but I will say what I have already said. Some of us have been around for quite a number of years, and while there certainly weren't the amount of obese people when I was young as there are now, there most definitely were people who were on the large size. I know people who got very large by eating food which was in no way UPF, they simply ate far too much. People are eating more than they used to because portion sizes are larger, why can't you get that? I know, I was there when people ate less - and I'm talking about things like cafes, where they bake their own food. People have got fatter, they don't want to take responsibility for it, so they look around for something to blame. Of course UPFs aren't good for us and we would all be better off eating proper food, but it's a cop out to blame them for everything.

I eat plenty of UPFs myself, but I don't eat any more of them than I do anything else - so these sophisticated techniques don't work on me, or on any of my friends.

Having been around for a decade or two longer than me (if your name means you were born in 1959) doesn’t give you quite the special insight you seem to think it does. Of course there were fat people before there was UPF. (Henry VIII, anyone?) Nobody thinks there weren’t, and nobody thinks UPFs are the only factor in the rise in obesity, so you can put your straw man away. And of course portion sizes have got larger. Nobody is denying that has happened…. I was born in the 70s and I remember it too.
But there has been an enormous jump in obesity which coincides in countries all over the world with the introduction of UPFs.
If it isn’t affecting you (bully for you!) it’s probably because your eating habits were established before this happened. Much of the shocking rise in obesity is among young people and children. And portion size is only one factor. If the food that is put on their plates is calorie dense and low in fibre it’s going to be a heck of a lot harder for them to eat an appropriate portion than it was for those of us who grew up eating relatively small portions of meat and two veg with every meal.

AllProperTeaIsTheft · 09/05/2025 22:43

I'd like to drastically reduce my UPF intake, but I'm gluten and lactose intolerant, which makes it harder. Lots of the free-from alternatives are massively full of UPF ingredients. Obviously I can eat lots of good, natural stuff - meat, fish, eggs, fruit, veg, rice etc and some cheese. But things like bread, pasta and flour for home baking are non-UPF for normal versions and UPF for gluten-free ones. It sucks!

Gattopardo · 09/05/2025 22:37

Does anyone remember the original Findus crispy pancakes (minced beef) and also M&S steak bakes from 1989? The dog’s bollocks.

Other UPFs from around that time:

that weird fluffy white diet bread
the cuppa soups at the pool after a swim, which served as substantive dinner that night

Fray Bentos and Pukka Pies.
Kraft packets
uncle Bens curry sauce
drinks and sweets with tartrazine, blue and other food dyes
Meat products with no provenance information on them
eggs from battery chickens were the norm … I could go on and on.
this isn’t an argument for UPFs, but the idea it’s all new in last decade is a complete falsehood.

NattyTurtle59 · 09/05/2025 22:14

TheCountessofFitzdotterel · 09/05/2025 07:48

And the reason why people are eating more than they used to….

You and those people are missing the point. People are eating more because there is now a class of food, often the most easily accessible one, that is specifically designed, deploying a whole raft of sophisticated techniques utilising everything from chemistry to psychology, to make them eat more.
And funnily enough it is much much harder to eat a healthy amount of it than it is with whole or minimally processed foods. Because the food technologists know what they are doing.

I'm getting sick of this, but I will say what I have already said. Some of us have been around for quite a number of years, and while there certainly weren't the amount of obese people when I was young as there are now, there most definitely were people who were on the large size. I know people who got very large by eating food which was in no way UPF, they simply ate far too much. People are eating more than they used to because portion sizes are larger, why can't you get that? I know, I was there when people ate less - and I'm talking about things like cafes, where they bake their own food. People have got fatter, they don't want to take responsibility for it, so they look around for something to blame. Of course UPFs aren't good for us and we would all be better off eating proper food, but it's a cop out to blame them for everything.

I eat plenty of UPFs myself, but I don't eat any more of them than I do anything else - so these sophisticated techniques don't work on me, or on any of my friends.

SnakesAndArrows · 09/05/2025 19:49

GameOfJones · 09/05/2025 18:50

@SnakesAndArrows it seems like you're looking for evidence that 100 calories of UPF Hovis will make you fatter than 100 calories on non UPF sourdough. If that's the case, I don't think you will find it.... because that's not what the UPF research is saying.

What it is saying is that there's clear evidence that it is easier to overconsume calories on a diet high in UPFs because they are highly palatable and easier to chew and eat. They are designed by the manufacturers to be addictive. As someone upthread said "once you pop you can't stop."

But I don't think weight is the main issue with them, there's also emerging research that some of these additives are harmful to human health and higher UPF consumption may be linked to increase in cancer rates e.g the study below. I do appreciate in this one they're not saying there is a definite cause and effect but with the increase of bowel cancer rates etc in relatively young people something is going on. The more research that emerges about UPFs the more dodgy they are looking.

What really worries me is children's consumption of UPFs in this country. It is higher than adult consumption in many cases and I do think there are a lot of parallels with tobacco 50 years ago or so.....huge corporations lobbying to keep the evidence on how harmful their products are under wraps.

I don’t disagree with what you have said at all - there’s good evidence of harm from certain additives and obviously junk food is nutritionally inferior.

Others appear to be claiming that the non-existence evidence exists. There are often posts on MN from people wondering why they still haven’t lost weight despite eating only home cooked UPF food.

GameOfJones · 09/05/2025 18:51

Argh sorry it wouldn't let me post the link! Look up the Lancet....UPF consumption linked to higher incidence of cancer.

GameOfJones · 09/05/2025 18:50

@SnakesAndArrows it seems like you're looking for evidence that 100 calories of UPF Hovis will make you fatter than 100 calories on non UPF sourdough. If that's the case, I don't think you will find it.... because that's not what the UPF research is saying.

What it is saying is that there's clear evidence that it is easier to overconsume calories on a diet high in UPFs because they are highly palatable and easier to chew and eat. They are designed by the manufacturers to be addictive. As someone upthread said "once you pop you can't stop."

But I don't think weight is the main issue with them, there's also emerging research that some of these additives are harmful to human health and higher UPF consumption may be linked to increase in cancer rates e.g the study below. I do appreciate in this one they're not saying there is a definite cause and effect but with the increase of bowel cancer rates etc in relatively young people something is going on. The more research that emerges about UPFs the more dodgy they are looking.

What really worries me is children's consumption of UPFs in this country. It is higher than adult consumption in many cases and I do think there are a lot of parallels with tobacco 50 years ago or so.....huge corporations lobbying to keep the evidence on how harmful their products are under wraps.

SnakesAndArrows · 09/05/2025 13:52

Jacarandill · 09/05/2025 11:58

It’s not my job to do this research for you. I’ve managed to work it out, as have lots of scientists. It’s just a weirdly pervading view on MN that our bodies are simple machines and you have to hardly eat anything to lose weight.

Oh I have searched. And searched and searched. But there’s nothing beyond opinion pieces. There’s a very good meta analysis from the BMJ last year but it doesn’t support what you are saying at all.

You’re making an extraordinary claim, it’s up to you to support that with evidence. I think if you really had any you would post it.

Jacarandill · 09/05/2025 11:58

SnakesAndArrows · 09/05/2025 06:52

Well, my brain prefers to use actual evidence rather than anecdotes from likely unreliable narrators. The only evidence posted so far is a study that in no way supports your theory, and an article in the Washington Post that’s behind a paywall. A cursory literature search hasn’t shown me anything more.

To echo your unpleasant tone, do better.

It’s not my job to do this research for you. I’ve managed to work it out, as have lots of scientists. It’s just a weirdly pervading view on MN that our bodies are simple machines and you have to hardly eat anything to lose weight.

Jacarandill · 09/05/2025 11:54

NattyTurtle59 · 09/05/2025 05:05

Maybe not, but as soon as there is any thread on MN regarding weight posters jump on saying it is all the fault of UPFs. Very few seem to be prepared to take any sort of blame themselves.

Blaming UPFs doesn’t take the blame off the individual. You can choose not to eat them!

TheCountessofFitzdotterel · 09/05/2025 10:07

The thread is about ultra processed vs everything else, not processed vs unprocessed.

Humans have been processing food for millennia. Ultra processing is more recent and distinct.

GoKatForDinner · 09/05/2025 08:23

You're not being unreasonable to think that non-processed food is better than processed food. However, the AIBU question in your title is unreasonable and difficult to understand! 🫣

Pinkishcherryblossoms · 09/05/2025 08:03

I've got no choice but to eat this crap. I'm too disabled to cook. Can't even stay up long enough to make a sandwich without falling over/fainting/ending up in an ambulance. I try to get the least bad things but I miss making my own bread and cooking my fresh meats, fish and veggies. DH can physically cook but he's terrible at it to the point of it coming out worse than freezer/packet stuff. He is good at some things but cooking is not one of them. He has terrible judgement, a bad memory and poor observation skills where raw foods are concerned. He tries but it often ends up in the bin due to tasting awful to the point of inedible. In The Simpsons where Homer tries to prepare Mr Burns breakfast but everything sets fire, that's DH. I swear he could set fire to water. If he cooks a bacon roll, it ends up stinking the entire flat out all day with the smell of burnt meat and looks like burgundy coloured plastic. It could break teeth and cut your gums and gullet. It's rock hard and tastes horrific, like I imagine burnt pig hair tastes and smells.

Saying all that, my previous diet of fresh foods did nothing to prevent me developing heart problems so I don't think it guarantees a long illness free existence. I've been aware about processed foods from a young age as our mum instilled in us the importance of fresh produce. She and my dad both died young despite eating healthy. It can be helpful to eat well etc. but, as I said, no guarantee.

Good luck to you. Sounds as if you're working hard to develop better habits for yourself. I hope you reap the rewards you seek.

TheCountessofFitzdotterel · 09/05/2025 07:48

NattyTurtle59 · 09/05/2025 07:38

I, and several others on this thread, have already pointed out that people tend to eat far more than they used to, whether that be large portion sizes or constant snacking. But of course that has nothing to do with it, much easier to blame something other than ourselves.

And the reason why people are eating more than they used to….

You and those people are missing the point. People are eating more because there is now a class of food, often the most easily accessible one, that is specifically designed, deploying a whole raft of sophisticated techniques utilising everything from chemistry to psychology, to make them eat more.
And funnily enough it is much much harder to eat a healthy amount of it than it is with whole or minimally processed foods. Because the food technologists know what they are doing.

NattyTurtle59 · 09/05/2025 07:38

TheCountessofFitzdotterel · 09/05/2025 07:32

‘Take any sort of blame’?
You are concerned that if we accept the analysis that UPFs are a large part of what has gone wrong with our diet in recent years, people won’t be blaming themselves enough? 🤔

I have never been overweight so I don’t have any personal investment in issues of ‘blame’ and guilt around food, but I find the hypothesis that UPFs are the problem a good deal more plausible than that of a contemporaneous collapse in willpower that just happens to coincide with the large scale introduction of UPFs.

I, and several others on this thread, have already pointed out that people tend to eat far more than they used to, whether that be large portion sizes or constant snacking. But of course that has nothing to do with it, much easier to blame something other than ourselves.

TheCountessofFitzdotterel · 09/05/2025 07:32

NattyTurtle59 · 09/05/2025 05:05

Maybe not, but as soon as there is any thread on MN regarding weight posters jump on saying it is all the fault of UPFs. Very few seem to be prepared to take any sort of blame themselves.

‘Take any sort of blame’?
You are concerned that if we accept the analysis that UPFs are a large part of what has gone wrong with our diet in recent years, people won’t be blaming themselves enough? 🤔

I have never been overweight so I don’t have any personal investment in issues of ‘blame’ and guilt around food, but I find the hypothesis that UPFs are the problem a good deal more plausible than that of a contemporaneous collapse in willpower that just happens to coincide with the large scale introduction of UPFs.

soupyspoon · 09/05/2025 07:23

When people quote things like the chopped nuts example above, what they dont say is that, this is insignificant in terms of the overall calorie intake mechanism. Yes there will be a slight change in how the body processes that food, but not so significantly that it would affect your CICO mechanism.

DancefloorAcrobatics · 09/05/2025 07:17

Fizbosshoes · 08/05/2025 21:09

I'm annoyed with myself for getting invested with this but.....
I usually have berries with nuts and Greek yoghurt for breakfast.
I recently bought chopped Brazil nuts thinking they would sprinkle further IYSWIM, and I would have less weight of nuts that way. (I don't want to get into the habit of weighing food again, unless for a recipe)
....but is chopping them considered processed, by your example? Will they have more cals per 100g in that form?

Yes, the process of chopping will damage some of the cell structure, therfore easier for the body to acess the fat/ nutrients.

I'd think you would use less chopped nuts compared to whole ones anyway. Unless you want your breakfast extra nutty. Not a hill I would die on!

SnakesAndArrows · 09/05/2025 06:52

Jacarandill · 08/05/2025 22:56

You cannot be suggesting, though, that a piece of sourdough bread that contains 100 calories is somehow less calorific than a piece of supermarket bread that contains 100 calories. A piece of fish that contains 100 calories is somehow less calorific than a piece of fake meat that contains 100 calories?

This is what I mean about obtuse.

Obviously, as a unit of energy, 1 calorie = 1 calorie. The difference is in how the body uses that calorie, how it stores fat and glucose, the effect of certain foods on the gut microbiome and the way the metabolism shifts and adapts.

It’s why there are so many people on MN saying that if they eat more than 1200 calories a day they gain weight.

Use your brain!

Well, my brain prefers to use actual evidence rather than anecdotes from likely unreliable narrators. The only evidence posted so far is a study that in no way supports your theory, and an article in the Washington Post that’s behind a paywall. A cursory literature search hasn’t shown me anything more.

To echo your unpleasant tone, do better.

tilypu · 09/05/2025 06:37

AusBoundDD · 06/05/2025 21:55

I like it, prefer Jason’s but it’s like gold dust these days! I really just buy fresh produce in M&S as I find it’s higher quality and lasts longer. I do agree though that their aisles are packed with far too many ready meal type things and UPFs!

Jason's are building a new bakery, that should be up and running by June, I believe. So hopefully supply will improve soon!

I miss their wholemeal ciabattin. They aren't making it at the moment.

ChillyPanda · 09/05/2025 06:15

For the ‘ are all calories equal? ‘ question…

https://www.washingtonpost.com/wellness/2023/06/13/weight-loss-calories-fiber-microbiome/

BitOutOfPractice · 09/05/2025 06:00

Tbh weight gain (or not) from eating UPFs is not my main concern with them. It’s other health issues.

As it happens, I am currently trying to shift some weight. So I’m looking at calories on everything. Nine times out of ten, UPFs don’t offer good “value” in terms of calories v volume and satiation. I’d rather “spend” 100 calories on some proper food that will keep me fuller longer, than some UPF that is smaller / less satisfying and I’ll feel hungry again in half an hour.

NattyTurtle59 · 09/05/2025 05:05

Jacarandill · 08/05/2025 22:48

No one (afaik) has said they’re the ‘sole’ cause of weight gain.

Maybe not, but as soon as there is any thread on MN regarding weight posters jump on saying it is all the fault of UPFs. Very few seem to be prepared to take any sort of blame themselves.

Jacarandill · 08/05/2025 22:56

SnakesAndArrows · 08/05/2025 19:46

How patronising you are. Yes, there is a food matrix effect that affects availability of calories for absorption to a small extent. A diet that encourages a fast gut transit time will also have an effect on absorption.

You cannot be suggesting, though, that a piece of sourdough bread that contains 100 calories is somehow less calorific than a piece of supermarket bread that contains 100 calories. A piece of fish that contains 100 calories is somehow less calorific than a piece of fake meat that contains 100 calories?

However, I know which I’d prefer to eat, and I know which is more nutritious. I just think there’s no need to wrap healthy eating messages up in pseudoscience.

Eat less, mostly plants, and move more.

You cannot be suggesting, though, that a piece of sourdough bread that contains 100 calories is somehow less calorific than a piece of supermarket bread that contains 100 calories. A piece of fish that contains 100 calories is somehow less calorific than a piece of fake meat that contains 100 calories?

This is what I mean about obtuse.

Obviously, as a unit of energy, 1 calorie = 1 calorie. The difference is in how the body uses that calorie, how it stores fat and glucose, the effect of certain foods on the gut microbiome and the way the metabolism shifts and adapts.

It’s why there are so many people on MN saying that if they eat more than 1200 calories a day they gain weight.

Use your brain!

Jacarandill · 08/05/2025 22:48

NattyTurtle59 · 08/05/2025 22:30

I wasn't actually eating like that to lose weight, it was a pleasant side effect. Once my emotional issues were sorted out then I returned to normal eating, but still didn't return to my previous weight.

The point I was making is that it isn't eating UPFs which makes people gain weight, portion sizes have increased greatly and it doesn't actually matter what you are eating, it is the amount that you eat. I eat a fair number of UPFs, alongside lots of proper food, and my weight rarely increases - if it does I just eat a bit less and off it goes again. I never "diet", I eat whatever I want.

People overthink this stuff. Obviously we should be eating healthy food, but this insistence that UPFs are the sole cause of weight gain is simply a very convenient excuse!

No one (afaik) has said they’re the ‘sole’ cause of weight gain.

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