For some of us (ex clyde here) - its not simply about how much you eat. It's all about what you eat and when you eat it.
Here's what it takes for me to lose weight - slow and steady, 130#'s over 4 years.
16 hour daily fasts - I eat lunch and dinner, no snacks. This limits insulin responses and inhibits fat storage.
Limited to no carbs - Whole food diet, mostly meat and vegetables.
Coupled with 120-150 miles per week of cycling, mostly Z2 low intensity.
Change any of that - weight loss stalls or results in weight gain.
And no matter what - I can't out exercise a poor diet.