the dynamics of impulsive eating

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Senior Member
"Understanding the impact of the Ten Commandments in curbing dishonesty might help prevent the next Enron-like fraud. And understanding the dynamics of impulsive eating has implications for every other impulsive decision in our lives—including why it's so hard to save money for a rainy day." (From Predictably Irrational by Dan Ariely)
Hi everyone,

According to Oxford Dictionary:
dynamics: the way in which people or things behave and react to each other in a particular situation.

So dynamics refers to the interaction between a group or more than two things, but impulsive eating is an only action. I'm stuck at this. Could you please explain to me the meaning of the bold part? Thanks in advance.
  • RM1(SS)

    Senior Member
    English - US (Midwest)
    Random House Unabridged:

    2. (used with a pl. v.) the motivating or driving forces, physical or moral, in any field.
    3. (used with a pl. v.) the pattern or history of growth, change, and development in any field.
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