NEW YORK — WeightWatchers is shaking up its leadership.
WW International announced Friday that CEO Sima Sistani would leave her role effective immediately. Tara Comonte, a WeightWatchers board member and former Shake Shack executive, was made interim chief executive.

The New York-based weight loss company didn’t reveal the reasons behind the abrupt move, but it noted that Comonte would step into the role of CEO at a time when the company is “focused on improving its operational and financial performance.”

WeightWatchers, which was founded more than 60 years ago, has struggled some recently. Its latest earnings repor …