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[–] onegin 0 points 3 points (+3|-0) ago 

Unlike all the other cells in your body, which can burn carbs or fat for fuel, cancer cells have lost that metabolic flexibility and can only thrive if there enough sugar present.

This sounds like a big oversimplification. I'd like to see a source. I am a big fan of cutting sugar but even with ketogenic diets AFAIK it is not possible to live without some circulating glucose. If you're not getting it from diet your body will scavenge it because there are a few systems that can't run on ketones alone.

Paul Jaminet of "Perfect Health Diet" writes a lot about the problems with very low carb-- http://perfecthealthdiet.com/category/zero-carb-dangers/

He advocates some combination of intermittent fasting and ketone promoting foods (coconut oil / MCT oil, ketogenic amino acids leucine and lysine, etc.). With these techniques you can still keep a lot of circulating ketones and get your body keto-adapted without lowering carbs too low.

Here is the article Mercola is supposedly drawing from: https://publications.credit-suisse.com/tasks/render/file/index.cfm?fileid=780BF4A8-B3D1-13A0-D2514E21EFFB0479