We've been warned the pandemic should be seen as a "wake up call".
Professor Niall Moyna says it's clear Covid has a harsher effect on people with pre-existing conditions, including those due to poor diet, smoking and a lack of exercise.
Speaking on The Joe Finnegan Show today, the Monaghan native said it's fantastic to see people taking up walking or running as exercise during the pandemic.
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He says research shows that elderly people in particular have a better immune response if they remain physically active as they get older.
But Professor Moyna has warned many people need to change how they're living their lives:
