Mostly this is OK. I suggest this change: "They often choose healthy snacks over unhealthy, and boring tasks over fun ones. " Also check that the switch of tense "choose ...
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Mostly this is OK. I suggest this change:
"They often choose healthy snacks over unhealthy, and boring tasks over fun ones. Participants also cheated less!"
Also check that the switch of tense "choose ... cheated" is intentional.