I think you would be amazed at the amount of things in the real world that're not just edible, they're healthier than most things that may be considered tasty.
Apart from the nutritional value of turtle meat, many cultures also value turtles as a food source. And my own grandfather would occasionally hunt up snapping turtles to prepare for a rare treat at family gatherings. He liked to batter and deep fry them, and serve them alongside fried catfish.
As far as programming on/off switches for every single item in the mod (because if she does it for you, someone else is going to want her to do it for them); it should be remembered that there's over 700 items in this mod.
A much simpler answer is to just not eat the turtles you catch. Use them to create turtle aquariums, to use as a pet. And before you point out that they only exist as items, I'm well aware of this. The default Minecraft fish also only exist as items, and many people have made aquariums for them. You could also practice "catch and release". Pretend to free them by throwing them back into the water they came from.
And now, my prediction of the day. Some day, someone is going to make you an amazing meal. You're going to have 3 helpings, exclaiming each time how absolutely delicious it is. When you ask what's in it, you're going to be violently ill to realize you've been eating (and loving) turtles.