It's not impossible, it just requires incentive. I've dropped 30 pounds this year by eating better (and much less) despite having a basket full of Hostess products sitting on the shelf and 2 liter bottles of sodas in the fridge. We just need to WANT to stop pigging out at every meal. For me, it was my cholesterol going through the roof of the skyscraper at my check-up this year (I was over 800! I think 150 is supposed to be the highest you go without being in danger) and generally being uncomfortable after every meal. Groceries get a lot cheaper when you're only eating half as much, and allows me to afford buying better quality foods.