Whenever I encounter a person who's frustrated about not being able to lose weight, in spite of their best efforts to control their eating, I wish it were as simple as just saying, "Well, guess what ? That just means you have to eat even less than you are now."
Now that IS true. But I quickly found out that when I said that, I'd typically illicit some eyelid-twitching. It's as if people are asking, "But how can I possibly do that ?"