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After Happy Healthy Vegan told Furious Pete that Meat causes cancer, Unnatural Vegan openly denied the connection. This video goes deep into the science showing several ways meat causes cancer.

Sources:
Mammal estrogens are 10,000x more potent than xenoestrogens and meat can contribute to 40% of estrogen intake:(http://humupd.oxfordjournals.org/content/12/4/341.full.pdf)

95% of cattle are given estrogen to increase growth:(http://ofbf.org/uploads/OFBFHormoneUseinAnimalAgriculturebriefing.pdf)

60%+ of all external estrogen from dairy:(http://www.sciencedirect.com/science/article/pii/S0308814697001507)

IGF-1 Levels of vegans and others:
(http://cebp.aacrjournals.org/content/11/11/1441.full.pdf)

IGF-1 in blood correlated with cancer:
(http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2743036/pdf/ukmss-27731.pdf)

IGF-1 and Cancer growth:
(http://press.endocrine.org/doi/pdf/10.1210/er.2008-0022)

IGF-1 and metasteses to bone, brain, liver, lymph system, etc. (http://www.cancerletters.info/article/S0304-3835(09)00662-4/abstract)

Willim Li’s TED talk:
(http://www.ted.com/talks/william_li?language=en#t-358989)

Switching to a plant-based diet and IGF-1:
(http://www.hindawi.com/journals/ecam/2011/529053/)

12g of meat protein per day can enter the large intestine:(http://ajcn.nutrition.org/content/32/10/2094.full.pdf)

Hydrogen Sulfide and DNA Damage:
(http://mcr.aacrjournals.org/content/5/5/455.full.pdf)

Meat Mutagens on Cancer.gov:
(http://www.cancer.gov/about-cancer/causes-prevention/risk/diet/cooked-meats-fact-sheet)

“…cholesterol is capable of regulating proliferation, migration, and signaling pathways in breast cancer.” (https://www.ncbi.nlm.nih.gov/pubmed/22867847)

Telomere repair on a plant-based diet:
(http://www.thelancet.com/pdfs/journals/lanonc/PIIS1470-2045(13)70366-8.pdf)