Screw productivity, think about your health. Your flawed thought process went to either eating a bad but fast meal or a heavy calorie lunch for 2 hours?

First, nobody 'wastes' 2 hours, just 30-45min in a regular lunch. Second, a healhty lunch means, adequate calories and nutrients. And that does not mean it will kill your productivity.

As a Spaniard, I'm very offended by your opinion. Also, I would like to know what your ancestors ate before all these ultraprocessed food existed, pretty sure it was more nutritious. Also, pretty sure they invested more than 10 minutes.