WATCH: What a cardiac nurse learned from her heart attack

Now Playing: Aspirin disappoints for avoiding first heart attack, stroke

Now Playing: Does a doctor’s gender affect women’s survival rates after a heart attack?

Now Playing: What a cardiac nurse learned from her heart attack

Now Playing: What to know about MS in wake of actress Selma Blair’s powerful interview

Now Playing: New details about woman who committed suicide after eye surgery

Now Playing: New study shows parents are sleep deprived in the first 3 months after baby is born

Now Playing: How to talk to your partner about plastic surgery

Now Playing: WWE wrestler Roman Reigns opens up about his leukemia battle

Now Playing: Actress opens up about ‘tears’ and ‘relief’ of MS diagnosis

Now Playing: New study claims a third of adults over 50 have a protein deficiency

Now Playing: Watch the pure joy of a girl with cerebral palsy take some of her first steps

Now Playing: FDA says mineral sunscreens are safe, chemical sunscreens need more research

Now Playing: Learn how to winterize your diet

Now Playing: FDA issues warnings of ‘young blood’ transfusions

Now Playing: James Charles loves gym class

Now Playing: FDA warns against ‘young blood’ treatments

Now Playing: Screen time for 2-year-olds and younger has doubled since the mid-90s, study finds

Now Playing: More than 40 pushups linked to lower heart disease risk for some

Now Playing: ‘Riverdale’ star reveals she’s seeking treatment for depression

Now Playing: Mom ‘fights’ her way to good health, losing 160 pounds