Totally agree.  Couple thoughts. Totally anecdotal with our family. 

Keto wasn’t sustainable for me long term and impossible to implement at a family level.   
When we just made large portions of protein available, we all found that we weren’t longing for more food as often. As a family we’re down to two meals a day mainly because no-one is hungry for more.
Things like a big slab of meat and a side of broccoli or asparagus.  Nothing starchy.  We don’t skimp on butter, gravies/sauces or salt so everything is really tasty.