Diet Gerson cancer diet?? Anyone tried

To be honest, no sugar (like no salt) gets close to being impossible these days. But as both are automatically added to so much (including bread) and exist in many forms (such as "healthy" fruit juice) the best advice is to be very conscious of what you knowingly add. A square or two of chocolate as a treat occasionally is unlikely to do any harm, health wise. A block is a different thing. Moderation is the key. And a breakout occasionally won't destroy all your good work!