Currently you're required to click 'eat' multiple times on food items with multiple charges if you want to consume them completly or until you're sated, it is a bit tedious as it plays the animation several times and if you're not currently wielding the item it will also play the "put weapon on your back, pull out consumable" animation multiple times.
It would be convenient if it were possible to consume a food item completly on until you're sated with a single prompt, it should take longer than eating a single serving but less so than repeating the 'eat single serving' process multiple times.