Health calculators sit in an awkward product category. Users want a fast, specific answer, but the inputs are personal, the underlying models contain assumptions, and a polished number can look more authoritative than it really is.
A keto meal-planning product makes those tensions especially visible. It may estimate energy needs, suggest macronutrient ranges, organize foods, and produce a weekly plan. None of those features should be presented as a diagnosis or a guarantee.
Here are practical UX and engineering principles for building this kind of tool responsibly.
1. Ask only for inputs that change the result
Every field creates friction and may increase privacy risk. Before adding an input, answer two questions:
