Hey folks, I want to compile a list of all the various theories that have been proposed throughout history for the causes of and contributers to obesity. Please add any to the list.

Gluttony. You are fat because you eat to much and can't control yourself.

Sloth. You are fat because you are lazy and don't exercise.

Sedentary Lifestyle. You are fat because modern society, things like cars and computer jobs and video games, have led to a much more sedentary lifestyle, which makes you fat.

Thrifty Gene. We are genetically programmed by evolution to store up as much possible energy in the form of fat during times of plenty so that we can survive during times of famine.

Toxic Environment. You are fat because there is tasty fast food everywhere you look.

Marketing. The food manufacturers invented the Mattel And Mars Bar Quick Energy Chocobot Hour and we can't resist their mind manipulations.

Supersizing. Portion sizes have gotten out of control and are making you fat.

Hyper-Palatability. The food we make these days, especially processed food, is just so tasty we can't stop eating it.

Stress/Cortisol. Stress induces cortisol production making you fat.

Bad Sleep. Bad sleep or lack of sleep screws up your body and makes you fat, and people are getting less sleep these days than they used to because electricity and reasons.

Volumetrics. Concentrated calories make us fat because we don't feel full.

Genetics. You are genetically predisposed to being fat.

Fat Makes You Fat. Fat is higher in calories per gram than either protein and carbs, so eating fat makes you fat.

Empty Calories. Sugar/Pop is an empty calorie so it makes us fat.

Bad Habits. You picked up bad habits from your parents and family, which made you fat.

Snacking. Too frequent eating makes you fat, because you get a constantly raised blood sugar or insulin level.

Not Snacking. Larger, infrequent meals make you fat because the blood sugar and insulin peaks and valleys are larger.

Gut Biome. Something is wrong with the bacteria in your gut, which makes you fat.

Virus. There's a virus going around, that makes you fat.

Vegan Superiority. We were never meant to eat animals, therefore omnivores and carnivores are fat.

Agricultural Revolution. We were never designed to eat refined sugars, starches or dairy, which make us fat.

Casein is a drug. European-derived cattle casein protein acts like a drug in your brain, making you gorge on it and get fat.

Dopamine (Carb/Food Addiction). Carbs (or food in general), causes dopamine hits similar to drug and alcohol addictions. Fat people are literally addicted to food, but unlike drug and alcohol addicts, they can't go cold turkey, because we all need food to survive, and so it's particularly hard to beat a food addiction.

Artificial Sweeteners. Artificial sweeteners trick you into being fat.

Hyper-Glycemia. Excess and roller-coaster blood sugar levels caused by carbohydrate intake (especially refined carbohydrate lacking fibre) cause hunger and make you eat more and make you fat. Closely related to Hyper-Insulinism.

Hyper-Insulinism. High insulin levels make you fat, so therefore insulin-stimulating foods make you fat. Also foods that cause insulin-resistance (like possibly Sugar/Glucose/Fructose/Starch/Carbs). Closely related to Hyper-Glycemia.

Leptin-Insensitivity. Something is causing leptin-insensitivity, possibly hyper-insulinism which makes you hungrier and so you eat more and get fat.

Added to list after original post:

Affluence. - You are fat because you are rich enough to afford lots of food. In a number of societies being fat was seen as a sign of being well off, and was desirable.