- Environmental
 - Pesticides
 - Hair Dye

- Foods
 
Environmental

There are some things which are shown to increase the risk of NHL.  

Pesticides

Statistics show that farmers live longer and have a lower incidence of cancer overall than the overall population.  There are several exceptions to that, and one exception to that is NHL, where farmers have a 50-200 times higher incidence rate than the general population.  Herbicides containing 2,4-D, such as Ortho Weed-B-Gone, and glyphosate used in Roundup are both linked to NHL. If you use weedkillers at home, use latex pesticide gloves and a respirator mask rated for herbicides (I didn't)!

Hair Dye

People who use dark hair dye are more likely to get NHL.   If you use dark hair dye for 20 or more years, the risk goes up to 5x higher than the general population.  Some studies show there is a higher risk for those who have dyed their hair more than 12 times.  The risk may be less now because some of the known cancer causing chemicals in hair dye were banned in 1980.

Foods

The following are lists of foods that have been linked to a higher incidence of NHL in various studies.  The direct links are not necessarily known, but by avoiding these foods it may not promote the NHL to grow and spread in my body.

- Animal protein, saturated fat, fried red meat and dairy foods

- Cheese, pasta and rice

- Meats, cheese, eggs, dessert foods, saturated fat, and monounsaturated fat, yellow/orange vegetables (eggs and yellow/orange vegetables are questionable because components in them are shown to help in other studies).

- Dairy (DLBC only), fried red meat (DLBC, follicular, T cell), coffee (DLBC)

No Caffein

Caffein is shown to make cancer cells hard to kill when heat shock is attempted to kill them.  Since I've got cancer cells still floating in around my bloodstream, I want them to be as easy to kill as possible!

Meat

Eating meat is shown to double the chance of getting NHL and other cancers.   From other studies, low fat white meats (turkey, chicken) are not shown to increase the risk, only red and fatty meats.   Things like baked chicken and turkey are neutral (don't help or hurt).

Processed Foods

In general, the more food is processed, the more nutrients that are taken out.  

Non-organic food also may contain traces of pesticides in them.  According to the FDAs testing, up to 3.3% of tested foods exceed the allowable limits of pesticide content. That means, for every 100 different food ingredients you eat 2-3 will exceed the limits.   It's a good idea to avoid anything that is non-organic.

Another even better reason to avoid non-organic foods is that buying food farmed with pesticides is promoting NHL among farmers (farmers have between 6-200x the rate of NHL depending on pesticide usage).