For beginners, she said, they're going to start exercising and watching what they eat: No junk food, very little sugar and plenty of fruits and vegetables.
Given recent studies documenting the increase in obesity among children, particularly in rural cities like Watsonville, Castorena has reason to fret; it's no secret that obesity and diabetes go hand in hand.
"I was 23 when I found out," said the 30-year-old Castorena, who checks her blood-sugar counts at least three times a day.
"And a few weeks ago, we found out my father had it.
He got the bad news at the Diabetes Health Center, a nonprofit group that belongs to the Pajaro Valley Community Health Trust.
It's a disease that's prevalent in the Pajaro Valley, because Latinos are twice as likely to get the disease than their Caucasian counterparts, said Gonzalo Coronado, director for the center.
For example, Castorena's father, Victor Sanchez, 50, was put on a fairly strict diet after he found out.
And with the right medication, Sanchez, a farmworker, will be able to rein in his skyrocketing blood-sugar count.
In Santa Cruz County there are an estimated 18,000 people living with diabetes and in the tri-county region of Santa Cruz, Monterey and San Benito counties, approximately 45,000 people.
However, as Coronado points out, when managed effectively, complications can be reduced, if not eliminated.
And the center tries to do just that, with only a small staff: Coronado, a registered nurse, a registered dietitian, an administrative assistant and a consulting physician.
The nurse is certified to teach every aspect of diabetes self- management; the registered dietitian helps create a plan that incorporates the foods you like to eat into a healthy, balanced diet; the physician tends to the care of the diabetic and sees to it that the medications are adjusted properly.