Building a KFC near a Manx school could tempt students into obesity, a head teacher has said.
Proposals for the food outlet on Peel Road, Douglas, have received approval.
Ballakermeen High School's Adrienne Burnett said putting it within 1,300ft (400m) from the institution was "just putting temptation in the way".
A KFC spokeswoman said it did not "directly market to children" and would "work with the local community to deal with any concerns they have".
The island's director of public health said the development would create "an additional source of excess calories" for children in the area.
Dr Henrietta Ewart said fast food outlets "contribute significantly" to obesity rates "through the provision of food that is calorie dense and large in portion size".
About 60% of the island's adult population are classed as overweight or obese, with 25% of five-year-olds falling into the same category.
The development would also house a Starbucks coffee shop and retail space.
Mrs Burnette said putting a fast food restaurant "so close to a school is just putting temptation in the way".
"I don't mind it being elsewhere on the island, but please, not so close to a school with 1,700 students," she added.
Passing the application, planners said while there was "no clear Manx policy position" on fast food outlets, the proposals would be "judged to be acceptable" under UK guidance.
A KFC spokeswoman said it would "work with the local community to deal with any concerns they have".
"We don't directly market to children and we want to listen and help where we can."