What really worked for me was keeping a food journal.  Write down everything you eat, everything.  Its even better if you can get a scale and weigh it out so you get a better idea of what you are eating.  Force yourself to log every handful of chips, trail mix, piece of cake, brownie, etc...

I was surprised at how the simple act of trying to find my journal, a pen and figuring out how many calories I consumed made me not want that piece of cake.  Having a hard and fast calorie goal also forced me to realize how little bits of junk food completely threw everything else out of whack.  Three large eggs are approx 210 calories and are filling, 3 Thin Mint Cookies are too (IIRC) but not nearly as filling.

Had to google “DFAC”.  No need to make us work harder to help you.

Seems to me you may have difficulty employing some of the techniques, or tricks, many use.  Do you have any buddies or training partners there that share similar nutritional concerns?  Sometimes they can be a darn useful crutch.

I also have the fat kid lurking in the back of my mind. I have supplemented my apparent inherent propensity towards sweets with lots of dried fruits like plums, dates, cranberries, apricots and figs. Try it, you might like it. My lunch consists of a huge round of watermelon dried dates and walnuts or a protein shake.