have a jar of mini chocolate chips by your desk and pop one in your mouth every time you google an interesting question on scholar or wikipedia.

Disagree. The target of your advice has reported serious health problems (and his akrasia would probably be a lot easier to overcome if it weren't for the health problems, according to my models (which are based only on what he has posted to LW and on information not specific to him)) so I would advise him not to choose what to eat for its reward value.

To help him decide what weight to give my advice, I will add that I have had serious health problems for the last 40 years.

Moreover, I have serious doubts about the usefulness of setting up blatantly artificial (i.e., self-imposed for the purpose of conditioning oneself) cause-and_effect relationships between desired changes in behavior and rewards even when the rewards have no expected negative effect on health.