Don't shoot the messenger :-)

This university study said every time we eat this, we add over 30 minutes of healthy life. What is it?

A: Eating peanut butter and jelly sandwiches. Among the foods adding the most amount of healthy life were peanut butter and jelly sandwiches (an average of 33.7 minutes), nuts and seeds (26.9 minutes per serving) and fruits (13.5 minutes per serving)

Today's question is

The number of Canadian families doing this increased rapidly during the pandemic. 70% of those who did this, continue to do it. What is it?