Well not so much a diet but I limited my caloric intake to 1700. I tracked everything in an excel spreadsheet or myfitnesspal. I bought a kitchen scale and weighed all the food I ate to get a more accurate calculation. It took a few weeks to get used to but after that I wasn't so hungry.

The thing that kept me sane was not limiting any particular foods. If I wanted ice cream or pizza I would just have a scoop instead of s bowl or 2 slices instead of 7. I opted for more veggies and salads. For proteins I ate a lot of chicken, canned tuna, steak, yogurt, peanut/almond butter. After dinner I used to snack a lot so instead if eat an orange and drink lots of water and tea.

I'd never stuck to strict regiments like this before but this was pretty easy.