The leading cause of death is cardiovascular disease. >90% of these cases can be attributed to an overweight population. It's not an easy problem to solve, but there has to be a way to fix it. Lots of calorie counting apps, activity trackers, motivational reminder apps, etc. Obesity is very complicated, but there are three basic facts: 1. Calories in, calories out is the golden rule. 2. The vast majority of calories…
I don't think that's a problem that is solvable with technology. It's a social problem. Less social inequality and better education, taxes on unhealthy food, less working hours. That would be necessary to tackle the problem. Obesity is just a symptom. I love the SV mindset: Let's not get to the reasons of something, let's just build an app and everything will be good.
To address a couple of the things you mentioned:
Better education: It's true -- when it comes to health and nutrition, there's a lot of misinformation out there and a general lack of knowledge of even the basics. Most people are not great at determining how many calories are in a meal, whether something is good for them, or even just remembering what they've eaten on a given day. There's a huge opportunity for technology to help people figure this stuff out and learn to make better choices (full disclosure: I work on an app in this space [1]).
Taxing unhealthy food: While we can't levy taxes, there are ways to provide similar incentives, for example by automatically giving people cash rebates when they purchase healthy food [2].
Can the tech industry solve obesity on its own? Maybe not. But I'd argue that trying to address what we can is a better option than throwing up our hands and saying it's a social problem.