I eat more meat and saturated fat than I do anything else but I also pay attention to micronutrients, and if I cannot constructively criticize myself then I have no business eating a certain way if I am not absorbing all the possible variables, causations and correlations. I refuse let somebody else say “I told you so” without fully understanding the risk if any?
What I like to do in reference to the recommendations below is add a little type 2 resistant starch (creates short chained fatty acids in large intestines) from raw sweet potato sticks I keep in the fridge in a glass of water to chew on periodically and some occasional wild rice (only) with my meats even though I’m anti-grain and fiber!
Some things also to consider:
Nutrient Deficiencies Can Also Play a Role
Some micronutrients are required for mucin production – notably vitamin D. [7, 8] Poland is fairly far north, and many of the Optimal Dieters could have been low in vitamin D.
Other important micronutrients for cancer prevention are iodine and selenium. Poland in particular had the lowest iodine intake and among the highest stomach cancer death rates in Europe. After Poland in 1996 began a program of mandatory iodine prophylaxis, stomach cancer rates fell:
In Krakow the standardized incidence ratio of stomach cancer for men decreased from 19.1 per 100,000 to 15.7 per 100,000, and for women from 8.3 per 100,000 to 5.9 per 100,000 in the years 1992-2004. A significant decline of average rate of decrease was observed in men and women (2.3% and 4.0% per year respectively). 
So among the Polish Optimal Dieters, the elevated gastrointestinal cancer risk caused by mucin deficiency may have been aggravated by iodine and sunlight deficiencies.
A healthy diet should be robust to faults. The Optimal Diet is not robust to glucose deficiency.
There’s good reason to suspect that at least some of the Optimal Dieters developed mucin deficiencies as a result of the body’s effort to conserve glucose and protein. This would have substantially elevated risk of gastrointestinal cancers. Thus, it’s not a great surprise that many Optimal Dieters have been coming down with GI cancers after 15-20 years on the diet.
We recommend a carb plus protein intake of at least 600 calories per day to avoid possible glucose deficiency. It’s plausible that a zero-carb diet that included at least 600 calories per day protein for gluconeogenesis would not elevate gastrointestinal cancer risks as much as the Optimal Diet. But why be the guinea pig who tests this idea? Your body needs some glucose, and it’s surely less stressful on the body to supply some glucose, rather than forcing the body to manufacture glucose from protein.
Fasting and low-carb ketogenic diets are therapeutic for various conditions. But anyone on a fast or ketogenic diet should carefully monitor eyes and mouth for signs of decreased SALIVA or TEAR production. If there is a sign of dry eyes or dry mouth, the fast should be interrupted to eat some glucose/starch. Rice is a good source. Since hepatic glycogen stores are depleted within 24 h of fasting, blood glucose concentrations are maintained thereafter entirely through gluconeogenesis. Gluconeogenesis is mainly dependent on protein breakdown (a small amount comes from the glycerol released during lipolysis) and it thus results in protein wasting. It is the effects of protein malnutrition that lead to the eventual lack of ability to cough properly and keep the airways clear, in turn leading to pneumonia and death during prolonged starvation; hypoglycaemia does not occur.  The concern is not only cancer in 15 years; a healthy mucosal barrier is also essential to protect the gut and airways against pathogens. …More
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