Quite a number of symptoms of hangover are direct result of low blood sugar. Almost all of the alcohol is processed by the liver. Liver also stores and releases sugar when needed. But the liver can’t do that while it’s busy processing alcohol. Sugar is the primary source of energy for the brain.A lack of sugar causes the brain to function at econo-mode.That is why, a person feels weak, dizzy, anxious, depressed and fatigued. He can't concentrate. He also can't see clearly.
Everyone who drinks to intoxication will suffer from low blood sugar, especially those who have little body fat or who have not eaten for more than 24 hours. They are particularly vulnerable because very little sugar (glycogen) is stored in their liver.
It should also be noted that the body compensates for a lack of sugar by producing other forms of energy, such as fatty acids. A higher concentration of fatty acids in the blood makes it acidic, which, in turn, causes a set of symptoms associated with alcohol hangover.
Among other reasons, the main reasons people feel so bad the morning after getting drunk is the poor sleep caused by acetaldehyde which is a toxic sedative that interrupts sleep cycle. Specifically, it can make you wake up repeatedly during the nights. That’s why heavy drinkers feel so fatigued and out of control when it comes to functionality that requires attention and energy. Nobody sleeps well after harmful drinking.
The alcohol is processed by the liver with the help of an enzyme that turns alcohol into acetaldehyde, a very toxic substance. Acetaldehyde is a chloroform like substance which is then further broken down into water and carbon dioxide in a split second. People, who develop a metabolic error, can't do so quickly and efficiently. As a result, acetaldehyde lingers on and accumulates in abundance.Hangover is a direct result of the erratic metabolism of alcohol by the liver. Accumulation of acetaldehyde explains both the presence and severity of hangover symptoms.
Obviously, the primary risk factor associated with alcohol hangover is excessive drinking. The severity of hangover symptoms can be explained by congeners, i.e. chemicals found in alcoholic beverages, such as methanol, histamine or polyphenols. It is suspected that methanol and its degradation products—formaldehyde and formic acid—may be the cause of the headaches, thirst, sweating and dizziness. It is therefore believed that dark spirits, which contain more methanol than clear ones, may produce stronger hangover symptoms.
Similarly, drinks that contain high levels of impurities may bring on hangover symptoms even when only moderate amounts are consumed. For example, zinc and other metals are sometimes added to alcoholic beverages as artificial sweeteners or to enhance flavor. That’s why artificially sweetened drinks, sweet cocktails will produce stronger hangover symptoms than drinks sweetened with real fruit juice.