How can you brain without eating?

monster
I work with my brain all day (and two fingers...) My job involves basically spending all day concentrating on really hard and abstract problems, sometimes under heavy pressure as well.

One of the things that annoys me about that is the following: if I don't eat enough carbohydrates, I can't concentrate anymore, make a sloppy job, and risk getting my boss upset (one of my colleague erased the "client database" by accident once. He can pretty much forget about getting a raise for the rest of his life...; that is the kind of thing I might do if I can't concentrate)

That in itself isn't a big problem, as I'm usually good at it. What annoys me is that as I'm getting older, it gets hard to keep my weight. If I eat less, which is really what one should do to loose weight, I get more "stupid", and I want to bite everyone (because I'm in a bad mood, not because I'm so hungry that I would eat humans...).

Is there any other way I can lose weight, without reducing my blood sugar? I know about exercising; I'm just wondering if there is anything else, as I don't like exercising TBH.
How can you brain without eating?
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