I like to torture my turtle!
Ok, so you know if you just put 5 pieces or whatever they're gone in about .2 seconds? (inhale!) Well, I let my turtle see that I have them, then I put them on her basking dock. So, she has to go up, grab one, and go in the water to eat it. I'm waiting for her to become really smart and throw them all in at once... but she's not. She's alone in the tank, but I guess she's suspicious of tank-reflection turtle. Or she can't think that far in the future. Oh, well. But that keeps her busy for 10-15 minutes. So, you get more satisfaction from a feeding than the 0.2 second gulp. That's just my idea.
Honestly, pets get overweight because they beg. And it's because they know it'll get them a treat. Who cares if they aren't hungry! And people confuse food with love, haha.
But if you know that realistically she is properly nourished and is just begging then you're just feeding her for your own fulfillment!