For his role in the movie "Father Stu" (due out this month), Mark Wahlberg gained 30 pounds by eating 7,000 calories a day. His diet included a dozen eggs, steak, half a roasted chicken, and a "nightcap" consisting of oatmeal, apple sauce, jam, almond butter, and molasses. 

While Wahlberg's slide into horrible nutrition was temporary — he lost the weight as soon as filming was over — for many Americans 65 and older, a slide into ever-worse eating habits hasn't made a turnaround.

A study published in JAMA Open Network reveals that between 2001 and 2018, the number of older U.S. adults with "poor diet quality" increased from 51% to 61%. Overall, people were eating more saturated fat and fewer whole grains.

Only a shocking 0.4% of people ate well enough to qualify as having an ideal diet.

For older adults, eating more saturated fat and fewer fiber-rich foods is a ticket to chronic disease, as well as loss of muscle mass and tone and increased risk of infection, cognition problems, dementia, and poor wound healing.

There's a revolution in healthy aging happening that I lay it out in my upcoming book “The Great Age Reboot.” Nutrition plays a big part, so make sure you get enough lean non-red meat protein, as well as plenty of vegetables, fruits, and whole grains.

And talk to your doctor about which supplements, such as vitamin D and a multivitamin, might benefit you.