Could getting sick change your metabolic abilities?

I've lost over 4 pounds since getting sick and now that I am better I am still losing weight. Today I was so famished in the morning I almost threw up and I never get hungry in the mornings and I had a normal sized dinner the night before so it's now like my dinner triggered this morning's hunger. I was also well hydrated so my hunger was not caused by thirst.

Updates
6 mo
I lost another 2 pounds from yesterday morning to this morning. Now down 6 pounds and no longer sick.
Could getting sick change your metabolic abilities?
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