Cause drinks are mostly made of water and sugar and there’s substitutes for sugar which have zero calories.
Your food doesn’t really have a analogue for that. You can lower the calories in food by using spices and stuff which is like the sugar replacement but you can’t replace the water bit with zero cal.
Except for maybe lettuce but that’s because it’s mostly water.
You could maybe infuse a lettuce leaf with cumin for a zero cal burger lol.
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