The WHO says

Worldwide obesity has nearly tripled since 1975.
In 2016, more than 1.9 billion adults, 18 years and older, were overweight. Of these over 650 million were obese.
39% of adults aged 18 years and over were overweight in 2016, and 13% were obese.

Why is there a global obesity epidemic?

Add answers in the format "Title - Link" that link to articles or papers that prove a causal link between a specific mechanism(type of food, ingredient, lack of exercise, etc.) and a population-wide increase in obesity at least the city-scale. It is not enough that a mechanism could cause obesity; it must be a significant actual cause of the observed increase in obesity statistics.

Argue in the comments to support or reject papers.

• At the end of 2024, every option resolves to market unless they get at least 10,000 mana in volume and bettors call for a poll. If just before closing there is a last-minute "attempted snipe", this market can be extended to allow the price to settle.

• If an option gets at least M10,000 in trading volume(defined as max(YES shares, NO shares)) and bettors call for a poll, @Mira will create a poll of expected values lasting 1 month for such option: It will resolve to the expected value implied by the "proportion of bettors times magnitude" in the poll.

• If the option gets at least M50,000 in volume and the poll attracts at least 25 voters and no option has more than 70% and bettors call for a decision, @Mira will read the arguments on both sides and resolve to @Mira 's expected value of such mechanism as a cause.

• At end of 2024, bettors can call for a market extension and it will be extended another year. If there is a dispute on whether it should be extended, I may use a poll.

Expected Value is in units number of people and is the sum of values (credence times magnitude). Given a denominator of 650 million obese people, and given that this "tripled since 1975" so is an increase of 433 million, then a Dirac Delta on 100% "50 million people" would resolve to 12%. So bettors must consider both their certainty and magnitude of people affected. Sum of credences must sum to 100%.

Market can resolve NA if somebody convinces @Mira that this market design should be canceled. @levifinkelstein would be my provisional statistics consultant if needed, since he loves to read arguments and has expertise in interpreting statistics, although he is not obligated to help.