Lots of people don't realize that 1 cup milk has 13g sugar from the lactose.

For comparison, a typical sugar packet is 2-4g.

(This is why cereal + milk is probably just about the unhealthiest thing possible to start your day).

It's a good idea to switch from the sugary/milky Starbucks drinks to anything else - like cold brew, or black coffee where you add trace amounts of sugar/cream yourself, if any.