When travelling for more than a few days, restaurants are not a viable option anymore, especially with the whole family. I used to find it difficult to find healthy options. But nowadays, the cost has become simply prohibitive.
The restaurant budget alone would be much more than hotels and flight prices combined, and we'd still be mostly eating bad, unhealthy food most of the time.
An Airbnb with a kitchen is a must. For extended stays, washing machines are super convenient also.
It seems like hotels are catching up. I stayed at many newer chain brands with decent full kitchen offerings. Still not quite the same as a real appartement/house, but they are fine and often not that much more expensive than your typical hotel room, just look out for it.