The control was not drinking coffee, and far lower all-cause mortality was observed in both black coffee and coffee with a tiny bit of sugar.
Or: Yes, adding a ton of sugar to anything is unhealthy, but this study provides far more information than that. Although it's observational, the observed effect is huge. From the study:
"Compared with nonconsumers, consumers of various amounts of unsweetened coffee (>0 to 1.5, >1.5 to 2.5, >2.5 to 3.5, >3.5 to 4.5, and >4.5 drinks/d) had lower risks for all-cause mortality after adjustment for lifestyle, sociodemographic, and clinical factors," [then repeats for lightly sugar-sweetened coffee, but not artificially-sweetened coffee].
Does Starbucks add sugar to the coffee? Or what do you mean. The ice coffee?
They serve coffee also.
If you google 'starbucks unhealthiest drinks', you'll find references to stuff like 'cinnamon roll frappucino blended coffee' which apparently had 85 grams of sugar in its largest size and 510 calories. If you're familiar with the 'packets' of sugar people sometimes sweeten coffee or tea with, 85 grams is like 20 packets. The 'sweetened cup of coffee' referenced in the study referred to a coffee with about 5 grams of sugar added.