Everything with nutritive value feeds cancer cells, just like any other cells. They are not fussy eaters. In fact, they will thrive and multiply on very little food.
Some people recover from cancer on an alkali diet. So do a few people who take coffee enemas, raw juices, potassium compound, thyroid hormone, vitamin B12, cottage cheese, flaxseeds and flaxseed oil, high dose porcine-based pancreatic enzyme therapy, vitamin C chelation, frankincense essential oil therapy, probiotics, Vitamin D, turmeric and curcumin, oxygen therapy, immune-Boosting bushrooms, and prayer and building peace. (all lauded on draxe.com/10-natural-cancer-treatments-hidden-cures/) They then instantly "go public" and write blogs about their wonderful miracle recovery, before they reach the 5 year comparison point which conventional therapies use as a yardstick.
Oh - and people also recover after conventional treatment, which is less hit-and-miss. They tend NOT to write eulogies about the drugs and/ or chemo and radiotherapy they received.
If these natural therapies are so powerful (and cheap), the NHS would have latched onto them long ago, and if tumours gobbled up acid, consultants would be giving all their patients pills to neutralise the hydrochloric acid essential for digesting food.