Americano (1 piece)

Choose decaf or half-caf Americano; caffeine can raise glucose for some people even without sugar.

Order it black and avoid sugar, syrups, sweetened creamers, flavored milks, and sweetened plant milks.

Have the Americano with or after a balanced meal rather than on an empty stomach, especially if your readings show a morning response.

Pair it with a protein- and fiber-rich option such as eggs, plain Greek yogurt, or a small handful of nuts instead of pastries or toast.

Try a smaller size or sip it more slowly, then compare your response with your usual serving.

Repeat the test on a different day while keeping sleep, meal timing, and activity similar to confirm that the coffee—not another factor—is driving the rise.