Weight / Fat loss

I can't avoid the large deficits on long rides - I'm already fueling at race levels - there's no scope for extra calories without being sick.

Not saying eat more while riding, but what about before and afterwards?

obviously better before than afterwards, but even afterwards stops the constant chase of the hunger monster for the rest of the week.

I'm obviously not riding as far as you but i do get 100 miles followed by a 3-5mile run in on Saturdays.

But even then I struggle to see how you get a 5000 calorie defecit if you are eating before during and after riding?!