> Assuming the caloric intake is the same, how does eating a peach smoothie differ from eating a peach?

Increasing the number of masticatory cycles is associated with reduced appetite and altered postprandial plasma concentrations of gut hormones, insulin and glucose [0]

[0]https://www.cambridge.org/core/services/aop-cambridge-core/c...

TL;DR It's not just about calories, it's about what the food makes you do later.