Can I get sick from this

I lost 177lbs in a little over 2 years. I have ate twice a day and whole wheat pasta everyday. I'm not hungry so I don't starve myself. I am 20yrs old. I am worried about diseases like diabetes etc. I joined a gym yesterday and the trainer got me scared about diseases. Last August at my checkup I was fine but I'm worried and I have a physical in a week.
Can I get sick from this
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