Starbucks is joining the protein craze with a new line of lattes and cold foams, part of what the company says is a strategy to modernize its menu.

The Seattle-based coffee chain said Tuesday that starting Sept. 29 it will add protein cold foams and protein lattes to its menu. The cold foam, which customers can order to top coffee, tea or Starbucks Refreshers, adds about 15 grams of protein to a grande drink. The lattes, made with "protein-boosted milk," contain 27 to 36 grams of protein, according to Starbucks.

The new menu items come as the company works to reignite sales after a revenue slowdown last year. Under CEO Brian Niccol, Starbucks has rolled out a "Back to Starbucks" plan to win back customers.

The new drinks "will resonate with our customers," said Tressie Leiberman, Starbu

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