‘Obese Despite Eating Under 1,200 Calories’ Turns Out to Be Underreporting — Actual Intake Twice as High, Columbia University Study Finds

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The story

A tracking study by researchers at Columbia University and others has been making waves on 5ch’s News Speed+ board. The researchers followed people for 14 days who insisted they weren’t losing weight despite eating under 1,200 kcal a day — and found their actual calorie intake averaged 47% higher than what they reported, with one person who claimed 1,028 kcal actually consuming 2,081 kcal. The thread mixed astonishment (“if you can get fat eating that little, the human body is way too energy-efficient”) with skepticism (“maybe people are underreporting, whether unconsciously or on purpose”), and the discussion spun off into debates over actual meal plans and whether calorie restriction even works.

Why isn’t the weight coming off? Because patients who said they couldn’t lose weight had, on individual average, underreported their actual food intake by 47%. While claiming 1,028 kcal a day, they were actually eating 2,081 kcal

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ITmedia

Source: itmedia.co.jp / Original article here

What people said

12AnonymousSep 13, 2026 04:16
Getting fat on 2000 kcal? Humans are way too energy-efficient lol
18AnonymousSep 13, 2026 04:21
Re: #12
Kazu Lazer's (a Japanese comedian) comedy partner barely eats but still gains weight
Probably has extremely high nutrient absorption, or just burns very little energy
Rough deal these days, but back in the old days that'd be a god-tier trait
Nowadays people are more grateful for the garçonne (French for slim, boyish-figured women) types who can eat anything and not absorb/gain weight
Back in the day he'd probably have starved to death fast
Or maybe he just doesn't die even without eating?
14AnonymousSep 13, 2026 04:18
Even on low calories, constipation can make you look fatter
21AnonymousSep 13, 2026 04:23
Re: #14
That's just your stomach bloating, not real fat
17AnonymousSep 13, 2026 04:19
But if you're already fat, wouldn't 2000 kcal be enough to lose weight?
90AnonymousSep 13, 2026 05:01
Re: #17
Back when I was in triple digits (100+ kg) and lifting weights,
I kept losing weight
even eating 3000 kcal a day
19AnonymousSep 13, 2026 04:22
Fat people's leg muscles must be insane though
It's like they're walking around carrying dumbbells all the time
162AnonymousSep 13, 2026 05:38
Re: #19
But it wrecks your lower back
The belly fat pushes down until the bones can't take it anymore
20AnonymousSep 13, 2026 04:22
I eat basically two meals a day like this and still can't lose weight at all
Meal 1: 2 slices of bread or instant ramen
Dinner: 200g rice, a side dish (130g meat, some vegetables), natto
Snacks: 2 cups of coffee and about 3 cookies
I don't drink juice or alcohol
24AnonymousSep 13, 2026 04:24
Re: #20
You should eat something like the meal in this picture

https://image-tm.s2mr.jp/i/original/1788314260643.jpeg
34AnonymousSep 13, 2026 04:28
Re: #24
Not bad, but being able to sit down and eat that calmly is a real luxury. The price isn't high though.
45AnonymousSep 13, 2026 04:36
Re: #24
Way too much rice
Way too little 🍖 meat
31AnonymousSep 13, 2026 04:26
'Drink and lose weight'
'Eat and lose weight'
Any functional food claiming that is 100% a scam
That much is crystal clear
108AnonymousSep 13, 2026 05:09
Re: #31
36AnonymousSep 13, 2026 04:31
I recommend the carb diet
Breakfast: udon & rice balls
Lunch: ramen & fried rice
Dinner: soba & curry
37AnonymousSep 13, 2026 04:33
Re: #36
That's the opposite
Isn't a 'carb diet' supposed to mean cutting carbs?
46AnonymousSep 13, 2026 04:36
Re: #36
For dinner that's basically just a drink
43AnonymousSep 13, 2026 04:35
Re: #37
Yeah, it means cutting them
I think it's actually pretty risky and you have to follow the rules properly
47AnonymousSep 13, 2026 04:37
Re: #43
You just need to cut back normally
Idiots go to the extreme of eating zero carbs, which is what wrecks their health
48AnonymousSep 13, 2026 04:37
Re: #43
That's the thing where if you run a calorie deficit, your muscle wastes away
50AnonymousSep 13, 2026 04:39
Re: #45
That's plenty
Protein isn't something you can only get from meat, you know
On top of meat and fish, you're also eating eggs and soybeans
56AnonymousSep 13, 2026 04:42
Re: #50
Brown rice would be fine, but some people just can't eat it
54AnonymousSep 13, 2026 04:41
Calorie restriction or calorie burning
In the end there's no other way
If you want to lose weight healthily, the latter is the only real choice
60AnonymousSep 13, 2026 04:45
Re: #54
Cutting even one bite of rice is equivalent to a decent amount of walking, so in practice restricting food intake is more effective
63AnonymousSep 13, 2026 04:46
Is it really about calories though?
I don't gain much weight even when I eat yakiniku
153AnonymousSep 13, 2026 05:33
Re: #63
Sounds like the yakiniku diet
69AnonymousSep 13, 2026 04:50
Are they fat because they lie
Or do they lie because they're fat?
70AnonymousSep 13, 2026 04:51
Re: #69
It's less 'liar' and more 'vain'
At this level, plenty of people fudge the truth regardless of body type
74AnonymousSep 13, 2026 04:53
Re: #45
Specialist doctors and the elite bureaucrats at the Ministry of Health, Labour and Welfare recommend a balanced diet
No point in you objecting to that
(lol)
78AnonymousSep 13, 2026 04:54
Re: #74
I'm not objecting to anything
Just stating my preference lol
81AnonymousSep 13, 2026 04:55
I think humanity needs to calm down and take a step back
Happiness is just the ceiling of the world you personally know
If curry and ramen didn't exist in this world
you simply wouldn't crave them
Endlessly stoking desire
and then having it 'always within reach' — that's the problem
We need to wake up to that
The more delicious things there are, the more the misery of restraining yourself from them keeps multiplying endlessly
83AnonymousSep 13, 2026 04:56
Re: #81
That's pretty much the truth, and honestly kind of obvious
92AnonymousSep 13, 2026 05:02
There's a 120kg woman who says she barely eats and still can't lose weight, but there's no way she could maintain that body if she really wasn't eating
I feel like a lot of extremely overweight people are just soft on themselves and dishonest
100AnonymousSep 13, 2026 05:07
Re: #20
Bet that coffee isn't black
166AnonymousSep 13, 2026 05:40
Re: #100
Maybe about 5 liters per cup
The total amount of sugar, milk, syrup, etc. was never mentioned
115AnonymousSep 13, 2026 05:12
Matsuko Deluxe (a famous Japanese TV personality) said something similar recently too — 'I kept wondering why I was gaining weight when I wasn't eating, but turns out I actually was eating'
127AnonymousSep 13, 2026 05:21
Re: #115
That's rich, coming from someone who's said she uses the rice cooker itself as her bowl — and eats two of those
123AnonymousSep 13, 2026 05:18
It's a problem that people who are mentally weak can't hold back, sure — but is a society where you're forced to hold back in the first place even a happy one?
Easily obtainable pleasures are running completely unchecked
Endlessly bingeable videos, addictive fun games
Food that's too delicious for its own health consequences
Drugs get regulated, but plenty of things that endlessly stoke pleasure go completely unregulated
A society that lines up pleasures right in front of you and then tells you to resist them — we need to recognize that's actually the unhappy society
155AnonymousSep 13, 2026 05:33
Re: #123
5ch itself is basically an unregulated digital drug too lol
The more you use it, the more of a socially awkward idiot you become, yet you end up feeling like you've gotten smarter

Background and key points of this discussion

Underreporting in self-reported dietary surveys is a phenomenon long known in the field of nutrition science, with prior research noting that the gap between reported and actual intake tends to widen for heavier individuals. What stands out about this new study from Columbia University and others is that it pinned down that gap concretely through 14 days of tracking. Reactions in the thread were split: some suspected individual differences in metabolism or absorption efficiency, while others argued the self-reports themselves were simply inaccurate. One point worth keeping in mind is that the gap between reported and actual intake isn’t necessarily deliberate deception — cases where people unconsciously overlook the calories in snacks, drinks, and seasonings are said to be common, so this isn’t something that can simply be chalked up to “lying.” Findings like this highlight just how hard it is to rely on self-reported calorie counts alone.

*This article is excerpted and summarized from the 5ch (News Speed+) thread “Tracking People Who Say They’re “Obese Despite Eating Under 1,200 kcal a Day” for 14 Days — The Reason They Can’t Lose Weight Is… Research from Columbia University and Others.”

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