I do take seconds and always have. The reason for this, I think, is because--well now it is part habit too--but my whole family usually went back for seconds my entire time growing up. I also do not know how to identify hunger and fullness (unless I am very starving or so full I am sick), so if it is put in front of me, I tend to eat until it is gone. Then, since we all go for seconds, I do the same with the second plate as well. I would be fine with one plate, I'm sure. If someone put a plate of food in front of me and said this will fill you, I probably wouldn't ask for seconds. That has never happened though, and I cannot regulate it myself.
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Diagnosed with classic Autism
AQ score= 48
PDD assessment score= 170 (severe PDD)
EQ=8 SQ=93 (Extreme Systemizer)
Alexithymia Quiz=164/185 (high)