Is losing 22 pounds within 1 month for a 21-year-old guy too much?

Anonymous
My guy friend claimed that he lost 22 pounds within 1 month and would be happy if I see him. He is about 5'10, used to be 178 pounds a month ago. Is this too much? Frankly speaking, I'm not quite sure whether to believe him :S
Updates
+1 y
Interestingly both guys and girls are giving very different feedbacks
Is losing 22 pounds within 1 month for a 21-year-old guy too much?
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