I made a similar video several years back but wanted to add a little bit to it and I also strongly feel this is a question many people ask themselves and may even use as an excuse to submit to their current state of health.
The bottom line is in most cases it's not your Metabolism that slowed down, it's you that has slowed down, combine that with more of a focus on comfort food and access to eating, maybe a little bit too much wine or beer in the evening and now with a lot more people sitting around at home because of Covid restrictions... Well it has become even easier to blame the gradual or even fast weight gain on some sort of change in your metabolism.
So no I am not going to discuss how you can magically speed up your metabolism since that is not the root of the problem, I do discuss how even small changes in your lifestyle can make it seem like your metabolism has slowed down and what you can do to fix that with not even that much effort.
Enjoy the show!