Maybe for context could you share any reference article or graph which triggered this question? Increased in relation to what, since when?
Not in the US, but from materials read before, it is a combination of things.
Typical causes of weight gain in an individual is simply more calorie intake than is being burnt off. Across a population you can consider environmental, lifestyle and social factors which may contribute to this.
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Higher calorie intake (super-sized portions, highly processed foods with high sugar and fat content, cheap convenient fast foods and drinks, expensive healthy/nutritional foods, growth hormones in meats?).
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Less exercise (infrastructure not built for cycling and pedestrians, less manual labour jobs, Netflix, Home delivery services, etc).
Health education, Food Advertising/Sponsorship, Chain loyalty discounts, Low wages (poverty), and Political influences would all play a part.
Doesn’t meet your power requirements (only up to 850VA) but i recommend Cyberpower Bric meets the rest. I have mine connected to my Proxmox host, usb passthrough to VM running HassOS with the NUT add-on. Neat little LCD and silent unless humming on battery. Can choose if you want an audible alarm enabled or put it on mute.
APC is still very well regarded UPS brand for small business, and your specs seems like they should be achievable across many leading brands. Have you looked into latest models for your spec?
Maybe share a list of candidates you’re considering and can get opinions on those?