Glucose
From Memory Alpha, the free Star Trek reference
Glucose (C6H12O6) is a type of sugar found in both fruits and humanoid blood and muscles. Glucose is a primary contributor to the creation of lactic acid and glucagon.
Among the symptoms of rop'ngor is fainting, a condition that Worf experienced following his contraction of the disease in 2365. While Worf denied fainting, Doctor Katherine Pulaski went as far as to rephrase herself, describing his condition as a dramatic drop in blood pressure and blood glucose level, leading to circulatory failure, causing unconsciousness. (TNG: "Up The Long Ladder")
Following Tam Elbrun's initial contact with Tin Man, his brain activity suggested that he had just come out of some sort of seizure. In addition, his blood pressure and glucose indicated general systemic stress. (TNG: "Tin Man")
As Data and Jenna D'Sora were in the process of sitting down for a meal, Data was attempting to explain to her that effects of a low serum glucose level before she interrupted them to discuss their relationship. (TNG: "In Theory")
Kathryn Janeway used a glucose bait in her attempt to capture a type of burrowing insect to find a cure for the virus she and Chakotay contracted from it while on New Earth. (VOY: "Resolutions")
When the Doctor introduced B'Elanna Torres to his family, which was described by her as being a "fantasy" and "ridiculously perfect", she paused the program, explaining that she was "stopping this before [her] blood sugar levels overload." (VOY: "Real Life")
