Alcohol and Driving Safety
The effects of alcohol are both short and long term, whether you drink socially or have been diagnosed with alcohol use disorder (AUD). Understanding how alcohol affects your body is a core part of defensive driving, it's one of the required topics in every TDLR-approved Texas driving safety course.
Short-Term Effects of Alcohol
Short-term effects of alcohol on your body and emotions are present regardless of how you consume it. Your liver can metabolize roughly one standard drink per hour, and factors like age, weight, gender, and liver health all affect how quickly your body processes alcohol. As you drink, your blood alcohol content (BAC) rises, which is used to measure whether you're capable of safely performing certain tasks including driving. Short-term effects include:
- Reduced inhibitions
- Lower attentiveness
- Reduced coordination
- Lower critical judgment
- Blurred perception and vision
- Mood swings
- Reduced core body temperature
- High blood pressure
- Passing out
- Vomiting
Driving under the influence of alcohol is illegal in every state. In Texas, a BAC of 0.08% or higher is considered legally impaired. However, everyone absorbs alcohol differently, and you may be impaired even below that limit. Body weight plays a significant role: a 100-pound person will reach the legal BAC limit with roughly half as many drinks as a 240-pound person. Gender matters too , alcohol doesn't dissolve in fat, and since female bodies generally carry more fatty tissue, alcohol becomes more concentrated and has a faster, stronger effect compared to a male of the same weight consuming the same amount.
For reference, one standard drink, regardless of whether it's beer, wine, or liquor contains about 14 grams of pure alcohol. That's roughly 12 ounces of regular beer (about 5% alcohol), 5 ounces of wine (about 12% alcohol), or 1.5 ounces of distilled spirits (about 40% alcohol).
Long-Term Effects of Alcohol
Heavy, chronic alcohol consumption is linked to serious damage across multiple organ systems:
- Liver — Chronic abuse destroys liver cells, leading to scarring (cirrhosis), fatty liver, hepatitis, and increased liver cancer risk.
- Digestive system — Alcohol damages the stomach lining, increases stomach acid, and can lead to nutrient deficiencies, including Vitamin B1 deficiency.
- Pancreas — Alcohol triggers harmful pancreatic substance production, which can cause pancreatitis.
- Central nervous system — Vitamin B1 deficiency can lead to Wernicke-Korsakoff syndrome, with confusion, impaired coordination, and memory difficulties.
- Cardiovascular health — Heavy drinking raises the risk of high blood pressure, irregular heartbeat, blood clots, stroke, and heart attack.
- Reproductive health — Long-term heavy drinking is linked to reduced fertility and, during pregnancy, increased risk of miscarriage, stillbirth, or fetal alcohol spectrum disorder.
- Bones — Alcohol disrupts calcium and vitamin D processing, raising the risk of osteoporosis and fractures.
No amount of alcohol, no matter how small or technically legal, is truly safe when you're getting behind the wheel. Understanding these risks is exactly the kind of knowledge a defensive driving course is designed to reinforce.
Want to understand the legal consequences of alcohol-related traffic violations in Texas? Read our guide to Texas alcohol traffic laws.