The measure in a Tsikoudia shot is usually 20ml, while for a 45ml drink. The calories they have are:
Shot 20ml – 58 calories
Drink 45ml – 130 calories

So Tsikoudia is a low calorie drink. Also, our increased Tsikoudia (38% vol alc) have the ability to increase our metabolic rate. So theoretically, Tsikoudia does not give us a lot of calories. But it is common to accompany it with high calorie foods that give us the opposite effect.
Caution: Increased consumption of Tsikoudia may produce opposite effects than desired.
ByRaki flavor team