Doesn't the first coffee in the morning help to "carb up"?

But really, the coffee one drinks in the morning to get into the right gear and set off for a new day of work and not ... serves no purpose???

According to British research published in the journal Appetite, and carried out by the University of East London, it appears that the wake-up effect of the first cup of the day is uniquely psychological and, indeed, those who imbibe juices, herbal teas and decaffeinated drinks show the same sprint as those who brew coffee.

The research tested the awakenings of two groups of people: a total of 88 participants aged 18 to 47 who were regular consumers of coffee for breakfast. Divided into two groups, the first continued to receive its steaming cup of caffeine just after waking up while the second group, totally unaware, was given decaf. After a short trial period, all participants in the two groups were asked about their morning performance such as concentration, levels of readiness to drive and work, responsiveness, etc., and their responses were found to be similar in both groups.
Thus, it would seem that the study has succeeded in demonstrating that the brain, even before the physique, requires its caffeine fix by unconditional reflex, despite the fact that physical performance is equivalent with or without the first cup of the day.

What to think: Every day a study comes out while the next day another one comes out that contradicts the first one ... therefore I still do not give up my good cup of coffee in the morning as soon as I wake up: even if the brain seems to be able to do without it to "carb up," why should I deprive my palate of the taste of coffee of which it is so fond?