Yes. What is needed is regular long cardio 45-60 minutes, at least somewhat intense, 5-6 days a week, and a much lower fat diet , and more fruit for anti-oxidants. The reversal process is slow, around 5% improvement a year. But that is far better than a more severe blockage.

But a stress test may not detect it. It did not detect my 99% blockages 9 months before I needed a triple bypass.

Body fat changes can occur much more quickly.