What is this a graph of?

What is this a graph of?

Now that October is reaching an end...

Here's an interesting question.

What is this a graph of of? What does it show?

Make your best guess.

Correct answer will be given in a few days (Sunday).

Updates
7 mo
Several very interesting guesses. Thank you.

This graph shows the percentage of overweight Americans.

The decline since 2022 is not because people are eating healthier, it's the increased use of weight loss drugs.
Updates
7 mo
Since no one guessed what the graph is, I'm awarding MHO to the most creative guesses for guys and girls.
What is this a graph of?
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