@Remaker
It's weird isn't it, how some people get the idea that one simple food can treat / prevent cancer or that a cancer patient can / should eat a particular thing.
It's the unwanted advice that frustrates me. I feel as though they are saying I got my cancer from a poor diet, if I'd only followed their advice I wouldn't have got it. It's such an enormous oversimplification, incorrect, misleading and sometimes downright dangerous ( like the soup in your post).
I knew someone who died because she followed weird advice like hugging trees. The doctors begged her to try conventional treatment, but she refused because she believed in the alternative crap. She originally had a curable early cancer. Two very young children. That was about 20 years ago now but it's something I'll never forget and wish those idiots knew about when they say "all you need is to eat garlic" or whatever.
I have to say I've been lucky with my friends so far, they have all asked me about food, not once have they advised. It's people I don't really know who have advised me - electrician, hairdresser (not mine, I went bald at the beginning of the treatment last summer), etc