You are so right when you say that what is regarded as healthy changes quickly! It can be very daunting when you just want to do the best you can possibly do.
First though, the Vit C debate. I asked my onc about my vitamin and supplement regime and she gave me the ok to take Vit C, fish oil and glucosamine (I had been taking these previous to diagnosis). She has a calm, sensible approach and in her opinion, you would have to take large doses for it to really have any harmful affect.
I think we all go through a lot of heartache about what to eat/not eat to help ourselves stay cancer free but in the end I think we know what is REALLY unhealthy and can avoid lots of sugary, fatty, low or no nutrition foods. I personally have settled with a large variety of REAL food, especially lots of vegetables, lean unprocessed meat, fruit and nuts. I avoid packaged food and my favourite treat is now some fresh berries with a spoonful of good quality yoghurt.
BCNA have a terrific booklet on Healthy Eating which you can download. It has all the latest recommendations from the medical and nutritional experts and some great practical suggestions on how to go about making any changes. Hope this helps. Take care. Deanne xxx