PEPSICO posted a 61% rise in quarterly profit yesterday on strong US sales of Frito-Lay snacks, but shares fell because of weak demand for its Gatorade sports drink and a conservative forecast.

Frito-Lay, the chips division of PepsiCo. announced a new line extension of Doritos and Tostitos brands in May that it said would use soy proteins and fibre to give half the carbohydrates of its tortilla chip brands.