Consuming high amounts of trans fat more than doubled the risk for non-Hodgkin’s lymphoma.

A few more foods to stay away from if you are at risk for lymphoma: beef, pork, lamb, and trans fat. Trans fat is found in partially hydrogenated oils. Foods with a lot of trans fat include anything fried (doughnuts, chicken nuggets, French fries), many commercially baked goods (cakes, pie crusts, biscuits, pizza, cookies, crackers), and margarine or other spreads. Those were the findings of this study:

Dietary Fat And Protein In Relation To Risk Of Non-Hodgkin’s Lymphoma Among Women, Journal of the National Cancer Institute, 1999

This was a good study: large (88,410 women in Nurses’ Health Study), prospective, long 14-year follow-up.

Intake of beef, pork, or lamb as a main dish was associated with a statistically significantly increased risk of non-Hodgkin’s lymphoma; the multivariate relative risk for consumption of these meats at least once per day as compared with less than once per week was 2.2 (95% CI = 1.1-4.4; P for trend = .002).
…
Higher intake of trans unsaturated fat was also statistically significantly associated with an increased risk of the disease; the multivariate relative risk for the highest versus the lowest quintiles was 2.4 (95% CI = 1.3-4.6; P for trend = .01).

They concluded:

In the Nurses’ Health Study, higher intakes of beef, pork, or lamb as a main dish, trans unsaturated fat, and saturated fat are associated with greater risk of non-Hodgkin’s lymphoma.

If you combine these results with those of the study in my prior post which fingered chicken (specifically, all poultry), a low-fat vegan diet would seem to be the way to go.