One factor is whether you’ve eaten recently.
When the brain is well-fueled, conscious decision making should lead the way.
Unconscious decision making works just fine without glucose so it should be relied upon when you’re hungry.
Via BPS Research Digest:
For the participants with low sugar, their ratings were more astute if they were in the unconscious thought condition, distracted by the second nature film. By contrast, the participants who’d had the benefit of the sugar hit showed more astute ratings if they were in the conscious thought condition and had had the chance to think deliberately for four minutes. “We found that when we have enough energy, conscious deliberation enables us to make good decisions,” the researchers said. “The unconscious on the other hand seems to operate fine with low energy.”
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