A lot of chronic pain is diet related (the initial injury isn’t diet related. But that it won’t get better and continually hurts is often diet related).
A lot of people people who switch to a keto or carnivore diet resolve chronic pains within a couple of weeks. Some, sooner.
Sometimes it’s the carbohydrates that lead to high insulin and glucose that causes the pain. Other times it’s certain compounds in plant foods - gluten for example.
Think you might find this interesting:
>A new study shows that for each pound of body weight lost, there is a 4-pound reduction in knee joint stress among overweight and obese people with osteoarthritis of the knee.
https://www.webmd.com/osteoarthritis/news/20050629/small-weight-loss-takes-pressure-off-knee