The data is taken from https://ourworldindata.org/obesity
People with a BMI > 25 are defined as overweight, people with a BMI > 30 are defined as obese. The data is available for the years 1975-2016 for many countries around the globe. All code can be found on Github.
With the code on Github, you will create an image for every year from 1975 to 2016, looking like this:
All images can be combined into a video via
ffmpeg -framerate 1 -i figs/%02d.png -c:v libx264 -profile:v high -crf 20 -pix_fmt yuv420p vid.mp4 yielding the video here (linking to this source).