First, they claim sugar is a cancer feeder, I have to ask, "What kind of sugar?" A health practitioner would have said which one, such as glucose, sucrose or fructose. You'd assume that glucose is meant but you'd be surprised to find that, according to studies, glucose does not affect cancer but sucrose and fructose might!
Glucose is everyday white sugar while sucrose and fructose come from fruit and veggies. This inaccuracy is charged against white sugar and is mostly baseless in terms of cancer.
It is a problem in our culture to have too high of a glycemic (white sugar) load but this is a problem of obesity and diabetes. There is evidence that cancer is more prevalent in obese people but likely this is due to insulin resistance and problems associated with metabolic syndrome/diabetes.
Second, they claim table salt has a chemical added to make it white in color and better alternatives would be Braggs' aminos or sea salt. There is no connection to table salt and cancer that I know of and a problem with using Braggs or sea salt is that you may not get iodine as table salt usually has it while the other choices may or may not have it. Our thyroid gland needs iodine to produce hormone.
The third claim is that there is a linkage to diet and acid/base balance that feeds cancer growth. The bottom line is that we cannot change the acid/base balance of our blood through diet. If we could, we would either pickle or cook our organs due to the food we choose.
Our body keeps a balance in place through homeostasis and parathyroid function. We correct the acid/base balance naturally and normally. Testing your saliva or urine is a waste of time. Saliva should be slightly acidic while waste (urine) will change as your body adjusts the acid/base of your blood. You are simply measuring excess waste not what your blood values are.
What is true is that the cancer cell creates its own acid environment and it does require that to thrive. Diet does not effect that, however.
Across the board I do suggest less red meat and more chicken and fish.
The forth point they make is to avoid coffee, tea and chocolate due to the caffeine content. This has nothing to do with cancer cells. But for good health reasons I do suggest avoiding too much caffeine, but in fact coffee is a proven food used to reduce risk of colon cancer.