Declining popularity of Heinz's products- in a world that values healthy eating got me reevaluating F&Bs. How are stocks like McDonalds doing better despite healthy fast food alternatives eg. Subway?

There's no way to know for sure.

What I know is that people still love fast food despite knowing its unhealthy.

Just like how everyone knows that exercising is good but not everyone exercises 3 times a week haha.

The only way to know is to track real data (like earnings, reveneue etc )

When that day comes, you might want to consider selling away the company if you're an investor.

McDonald's have transformed themselves over the years by putting labels of calories so it became a healthier option.

They have moved along with times and adapted.