Can a poor diet make you this weak?
There's two pieces to this puzzle. Firstly, the job I do involves all manner of manual labour; quite a bit of heavy lifting, and a little bit of mental power to juggle different tasks that all require attention, with various urgencies. I am fully capable of doing this job, and have a personal mantra on the job's busier days - "If you're not sweating, you're not working hard enough." (Oh, but I only get 3-4 days a week.) This evening was one of the quieter days. However, I could barely focus on the job, not from a lack of trying. My mind had disappeared; apparently to concentrate on other things, but there were moments where I would stop and think "What was I doing?". Meanwhile, the lifting was not half as bad as I can typically do; however, a few hours in, my arms were shaking just trying to keep some things up. I'd like to think today was an off day, but I've never had an "off day" be quite so difficult to do.
Now, I've been doing this job for a few months. I've also been living alone, and due to financial strains, I've lived a good portion of my time on dry pasta; fruit and veg has often been a luxury; as has meat and fish. Though I do get fed a meal in work, often on those days, it's the only meal I will eat; and will barely have time to eat it. So basically, I've lived on rations. Is it possible that only now, several months after this lifestyle began, my body is beginning to react to low levels of nutrition? And what can I do to quickly get back into the swing of my ability? Please don't say "See a doctor", because a. I'm not that worried, I just want to know how to get back to my A Game, and b. I obviously cannot afford it.