NANNY-STATE health chefs want traditional Cornish pasties without pastries to reduce their calories.
Boss at an NHS organization thinks the short-time dough around the 600-year-old treat is too thick.
They want to fill the beef, the potatoes, the onion and the swede with pasta with less fat.
Royal Cornwall Hospitals NHS Trust, which runs all three large hospitals in the province, is developing the recipe with the catering company.
The pies are sold in the restaurants and shops, but can be rolled out nationwide.
Furious critics said that "mixing" with Cornish pasties in Cornwall was "out of the blue" and swore to remain faithful to the recipe.
Christopher Snowdon of the Institute of Economic Affairs, added: "Make salads and other low-calorie options available in all possible ways, but stop trying to reformulate Britain's best food."
The storm erupted after the trustee Jill Venables of the trustee told the annual conference of Public Health England about his new pie – which contains less fat and calories.
Jill, originally from Yorkshire, said: "One of the problems I have is that I manage facilities in Cornwall and you know what traditionally everyone wants – it's Cornish pie, some people eat three a day. "
A large Cornish pie contains about 770 calories – more than a third of a woman's recommended daily allowance.
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It also contains 21 grams of saturated fat, which is 1 gram more than they should have on a whole day.
The Cornish Pasty Association said that the term "Cornish pasty" is legally protected and that the new recipe does not comply with the rules.
And Malcolm Bell, chief exec of Visit Cornwall Tourist Forum, said: "Most of us are smart enough to make our own decisions about what we eat – we do not need the nanny-NHS to nag us."