These before-and-after photos show why the future of Weight Watchers is uncertain

What's next for Weight Watchers?

The future looks uncertain for an old-school brand facing a new wave of competition from free or less expensive diet plans popular on Instagram and Pinterest. 

Weight Watchers' typical membership would cost about $460 per year, while the new competitors are free or a fraction of the price. 

The brand's shares fell Thursday after the company's outlook for growth failed to meet Wall Street's expectations. 

We broke down the main competition that's challenging Weight Watchers' future as Instagram continues to change how people diet and share results.