Study shows that dogs are healthier when few once a day.

[Catherine]

A University of Arizona study concludes that dogs age better and avoid certain health problems when fed once a day. The study did look at a large number of animals. So statistically it is good.
They do need to do further work to analyze the amount fed and other factors.
However it does look like  the key factor is the frequency of feeding.

https://www.dailymail.co.uk/sciencetech/...tions.html

This does make sense. Carnivores would not naturally eat frequently. They would more likely eat their fill and then sleep for a day.
I wonder if they looked at breed differences and age differences of their samples.  This is a good study. It will be interesting to hear their final conclusions when
they have looked at other factors.