Tren can cause insulin resistance which can actually promote fat storage. If you are starting your tren cycle at a reasonably high body fat, you are really going to want to take every precaution possible to keep your insulin sensitivty as high as possible.
There are a couple things you can do:
1. Stick to low GI carbohydrates like oatmeal, brown rice and sweet potato. Fruits are fine in moderation but the problem with fruit is that it's very high in sugar and will cause a spike in blood sugar and insulin. I would limit fruit to one serving per day max.
2. A good nutrient portioning supplement like N2slin from n2bm.com will also help because it will increase muscle insulin sensitivity.
3. Supplement with 6-10g of fish oil per day to increase muscle insulin sensivity as well.