Chris van Tulleken's book Ultra-processed People
on the impacts of ultra-processed food has been popular in my circles recently. Here's my one-paragraph summary of it:
NOVA category 4 foods (UPFs) afford addictiveness gradient descent impossible for categories 1–3. The multifactorial impact of diet on health means that UPF's single-targeted descent neglects or worsens a broad range of health outcomes, explored at length in the book. Financial incentives preclude private companies acting to solve the problem, and thus far the complexity of the science combined with lobbying and water-muddying behaviours of the same has prevented effective regulatory intervention.
If you're interested in reading about the particular health outcomes, the bad behaviours of some of the food companies, or proposed regulatory solutions, then I recommend reading the book—it's widely available at libraries in the UK.
I particularly appreciate that it uses a lot of UK examples rather than being exclusively US-based. This made it feel a lot more applicable to me than other books of this type.