In terms of an individual's diet, how many stages of behavior change are typically described by psychologists?

Six.

Explanation:

In terms of an individual's diet, Six  stages of behavior change are typically described by psychologists

Following are the stages of behaviour control :

1) Precontemplation : Unaware of the problem

2) Contemplation : Aware of the problem and desired behaviour change

3) Preparation : Intends to take action.

4) Action : Practices the desired behaviour

5) Maintenence : Works to sustain the behaviour change.

6) Relapse .