Dermatologists know that people who eat more fat and animal food get more acne, wrinkles, skin lesions, and skin cancer. But they have disincentives in relaying that information: the meat and dairy industries, the US government that promotes the meat and dairy industries, and patients who may be put off by advice to eat less meat and dairy.
Diet And Dermatology, The Role of Dietary Intervention in Skin Disease, The Journal of Clinical and Aesthetic Dermatology, 2014
Here are a couple studies … This next one uses the gold-standard, randomized control trial (RCT). It found that those eating a low-fat diet (less than 21% of calories from fat) significantly reduced occurrence of skin cancers vs. those eating a normal-fat diet (~38% fat):
Evidence That A Low-Fat Diet Reduces The Occurrence Of Non-Melanoma Skin Cancer, International Journal of Cancer, 1995
These data indicate that a low-fat diet can significantly reduce occurrence of a highly prevalent form of cancer.
In this next one, an 11-year prospective study, a meat- and fat-rich diet was found to increase risk for squamous cell carcinoma (SCC), a type of skin cancer:
Results: The meat and fat pattern was positively associated with development of SCC tumors (RR = 1.83; 95% CI: 1.00, 3.37; P for trend = 0.05) after adjustment for confounders and even more strongly associated in participants with a skin cancer history (RR = 3.77; 95% CI: 1.65, 8.63; P for trend = 0.002) when the third and first tertiles were compared. A higher consumption of the vegetable and fruit dietary pattern appeared to decrease SCC tumor risk by 54% (P for trend = 0.02).
Conclusion: A dietary pattern characterized by high meat and fat intakes increases [squamous cell carcinoma] tumor risk, particularly in persons with a skin cancer history.
A relative risk (RR) of 3.77 is approaching a 4 times increased risk for skin cancer. That’s high.
I know you know all this because you read my blog. Here’s a post about melanoma skin cancer from last year:
Study: Red Meat At Least Once A Week Led To Poor Outcomes In Melanoma Skin Cancer (Fruit Improved Outcomes)