Popeye has a historical background.
In fact, this animation, like China's Haier Brothers and Power Boys, is sponsored by merchants.
In the middle of the last century in the United States, some scientists claimed that "spinach is rich in nutrition" and gave surprising data. Therefore, there was a craze for eating spinach at that time, and spinach canners made a lot of profits. At this time, spinach canners sponsored Popeye's filming to guide children to eat spinach, which contributed to the sales of canned spinach (because the taste of canned spinach was so bad that children didn't like it), and in fact it also had this effect.
But now scientists' analysis shows that spinach contains various nutrients, but it is not as magical as it was said at that time.