It seems different races and ethnicities of people react differently to different things genetically.
For sure! But to say it’s only that genetic cause is quite a stretch. Either way, if you do ingest less calories that you output and you gain weight, you’d be quite an specimen for study, wouldn’t you?
It’s odd to think that obesity would be controversial in any way possible.
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Under that^ circumstance, if a person gains weight, it is due to chronic inflammation.. under-eating will only worsen the situation.
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You need to get a hobby.
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Yes and no. Chronic inflammation would make your body swell and flood tissue with water.
Technically yes, you gain weight that way, but at the same time thats not really body weight, thats your body drowning you in water.
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Lifestyle definitely contributes to these things and there is a reason why hunter gatherers living in the Brazilian Amazon are some of the most healthiest specimens of human beings today.
We have this modern technological society of ours but with that comes a great deal of many negative costs to maintain it.
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This is very true 
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So only inflammation could make a person put on a substantial amount of weight in such a short amount of time, while eating nothing and drinking toxic slop.
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I shrunk a whole dress-size within days, after resolving my inflammation issue.. the situation ain’t gonna take care of itself, One has to actively abstain from all triggers whilst simultaneously supping-up.
If you have this affliction then ofc thats the case. I entirely believe you.
You’d become pretty much a sponge every time your body decides to throw a hissyfit.
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..which sounds like what happened to F1.. easy to fix, if he really wanted to.
these posts were relevant before fj deleted the clown & their replies
Causes of obesity - AI produced, I asked for each category to present a diverse set of 8 causes. There are many more:
Biological & Physiological
Genetic predisposition; epigenetic changes shaped by prenatal or early-life stress or nutrition; differences in metabolic rate and energy efficiency; hormonal regulation of hunger and satiety (including leptin and ghrelin signaling); insulin resistance and altered glucose regulation; sleep deprivation and circadian rhythm disruption; aging-related metabolic changes and loss of muscle mass; gut microbiome differences that influence energy extraction and appetite.
Psychological & Emotional
Emotional eating as a coping strategy; chronic stress and elevated cortisol; depression and low mood; anxiety and hypervigilance; trauma history including childhood sexual abuse; attachment insecurity and fear of abandonment; shame and negative body image; learned association between food and emotional soothing or safety.
Behavioral & Lifestyle
Sedentary routines and low daily movement; frequent consumption of ultra-processed foods; sugary beverage intake; large portion sizes; irregular meal timing or night eating; rapid or distracted eating (e.g., while using screens); alcohol consumption; repeated dieting and weight cycling leading to rebound eating patterns.
Environmental & Societal
High availability of inexpensive calorie-dense foods; aggressive food marketing and advertising; urban environments that discourage walking or physical activity; long work hours reducing time for cooking or movement; shift work disrupting biological rhythms; food deserts or limited access to fresh foods; technology replacing physical labor; cultural normalization of oversized portions.
Developmental & Family Factors
Early feeding practices that override hunger cues; using food as reward or punishment in childhood; parental modeling of eating behaviors; household stress or family conflict; adverse childhood experiences (ACEs); bullying or weight stigma during childhood; lack of safe play environments; intergenerational transmission of coping patterns involving food.
Cognitive & Learning Factors
Habit formation around eating routines; dopamine-based reward conditioning from highly palatable foods; poor awareness of hunger and fullness signals; impulsivity or difficulty delaying gratification; decision fatigue affecting food choices; all-or-nothing dieting beliefs; scarcity mindset shaped by past deprivation; executive function or planning difficulties.
Social & Relational
Social isolation or loneliness; relationship stress or conflict; caregiving burden and emotional exhaustion; peer group eating norms; social celebrations centered on food; lack of supportive networks for healthy behavior change; parenting stress reducing self-care time; cultural identity and belonging expressed through shared food practices.
Structural & Cultural Influences
Socioeconomic inequality limiting health options; chronic financial stress; food industry incentives promoting overconsumption; weight stigma and discrimination increasing stress and avoidance behaviors; migration or cultural transition stress; community instability or unsafe neighborhoods; healthcare access barriers; societal normalization of sedentary entertainment and screen-based leisure.
Of course, but people can get obese even in a coma. And can get out of obesity outside a coma. Even pets can get obese.
So, even tho some are indeed causes for obesity, it’s grouped up with causes of things that lead to obesity, and most of them involve choices (so it’s not simply a causal relationship)
For example, ‘what is the cause that you stole my bike?’ - ‘It’s society’s fault’ is not a cause, since that person chose to steal your bike. If one of those causes involve people choosing to eat and choosing to not know what they eat, and how they exercise… those are not causes
My main reaction is walk a mile in their shoes. Let’s say we have 22 year old overweight childhood sexual abuse victim who has moved through foster homes. I don’t think the conversation about calories in, calories burned is remotely complete. In the absence of more, I don’t even think it counts as true, in that conversation. We’re humans, not combustion engines or something. You will likely have to deal with the effects of a host of other causes to maintain a good weight in those shoes.
You went directly to someone who takes no responsibility for their actions. So, you went from overweight - where the overweight person is hurt by their state and patterns - to someone who caused harm (financial) to someone else. Then you had them deny all responsibility.
Why do you think you presented this instead of something more charitable.
It seems like few people in the thread are angry, perhaps at overweight people in general. The OP mentions diet soda. Diet soda, in many people contributes to gaining weight or not losing weight. We could just keep saying to someone - calories in, energy burned and be sure this is true and good communication, but I don’t think it is.
If something is a coping mechanism, this habit can be embedded very tightly. If the person is simply kinda ignorant about the rules, then a simple information session with some nutritional advice might be all they need. They might find healthy food tastes better than the crap they were raised on and find the invite to a jogging club just plain old fun. No resistance, just smooth flowing from one pattern to another.
The person living with a sick child that requires round the clock care will need tricks to get decent meals for themselves. The person who works nights and does not sleep enough or well with need other causes looked at. And so on.
I have the completely opposite view. For the same person, to see that our human body is like a combustion machine brings lots of hope, and a definitive path forwards. If someone says the cause is the context, well, since you can’t change it, there’s no point in trying anything.
I used an example, and as with all examples, it is the same in the characteristics that are the same, and different in the characteristics that are different. The context doesn’t matter. The point being that what are causes are confused with what are choices. They’re not the same. You have a choice in choices, and that’s precisely how you can change. I presented this because it’s way clearer in this - if you miss the content for the context, I cannot help you there.
I don’t see people angry at overweight people at all in here. Calorie deficit is clearer than pointing fingers towards context and being, because of that, mostly unable to change and condemned to it. It’s quite a depressing viewpoint.
Now, from that calorie deficit as a definitiely attainable goal, one can then try to point out how to get there. There are easier ways than others, for sure, but that depends on personality, mostly, and for some people something strict is the way, for others the complete opposite.
Neither of that denies that people in Nauru are the most obese nor that calorie deficit is undeniable as the only cause of getting your fat cells smaller.
I see ‘someone’ with multiple sock puppets can’t stand being beaten in an argument so he eliminates it and keeps posting his shallow, unresearched drivel. Frankly I don’t give a rat’s arse how fat Americans are. I know how to stay ‘unfat’ because I’ve done the research and lived it. If Americans are too thick and lazy to do that then who cares?
Just to reinforce the point re Polynesians to the thicko who doesn’t seem to understand, at his peak Tongan Jonah Lomu had a BMI of 32.5 which is in the ‘obese’ range. The man was solid muscle 
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The OP’s matter of concern was this.. 
Only inflammation from an intolerance through ingestion, could have caused that.. the point being, would he do it again hoping for a different/positive result?