Nescafe - Original Instant Coffee, Black, No Sugar, 3 cup (2g coffee) (1 serving(s))

Reduce the serving from 3 cups to 1 cup, sip it slowly, and compare your glucose response before increasing again.

Try decaffeinated instant coffee or half-caf; caffeine can raise glucose for some people even when the coffee contains no sugar.

Avoid coffee on an empty stomach. Have it with a balanced meal or snack such as eggs, plain Greek yogurt, or a small handful of almonds.

Drink water before and alongside the coffee, especially if you have had little fluid overnight or after exercise.

Check that nothing is being added inadvertently, including flavored creamers, milk powders, sweeteners, or supplements; prepare it with plain water only for a clean comparison.

Try having coffee later in the morning rather than immediately after waking, and track several repeat tests to identify the timing and amount that work best for you.