 Evidential Decision Theory of the sort developed by Jeffrey (1983), runs into well-known problems in variants of Newcomb’s problem (Nozick 1969). For example, suppose Cheryl believes the following: She periodically suffers from a potassium deficiency. This state produces two effects with high probability: It causes her to eat bananas, which she enjoys; and it causes her to suffer debilitating migraines. On days when she suffers from the potassium deficiency, she has no introspective access to this state. In particular, she is not aware of any banana cravings. Perhaps she rushes to work every morning, grabbing whatever is at hand to eat on her commute. Cheryl’s causal model is represented by the DAG in  Figure 10.