Dr Baker has shown-in mice, at least-that ageing body cells not only suffer themselves, but also have adverse effects on otherwise healthy cells around them.
" My father always has positive thoughts… so he is in a great mental health condition. In terms of physical health, he has gotten much stronger, " Siripan says.
So, on one level, it's just a perfectly nice and reasonable thing to wish someone good health, if they've just done something that indicates that they're not in particularly great health right now.