Nutrition - Lecture 7

What is the total body water percentage of an adult human?

60%

What are the primary functions of water in the body?

Solvent for biochemical reactions, transportation of nutrients and waste, core body temperature regulation, lubricant for joints and membranes, shock absorption, and structure for cells.

What percentage of total water intake comes from beverages?

80%

What is the AI for total water intake for males aged 19-50?

3.5 L/day (3500 mls)

What is the AI for total water intake for females aged 19-50?

2.5 L/day (2200 mls)

What is dehydration?

Loss of solutes and water from the body.

What are the symptoms of mild hypohydration?

Impaired cognitive function and physical performance.

What is the recommended method for athletes to assess fluid status?

Weigh before and after activity, replenishing 1 lb lost with 500 ml (2 cups) of water.

What are common sources of caffeine?

Coffee, tea, soft drinks, energy drinks, chocolate, and medications.

What are the potential negative effects of excessive caffeine intake?

Irritability, nervousness, insomnia, and toxicity leading to vomiting, seizures, and tachyarrhythmias.

What is the caloric content of alcohol?

7 kcals/g of alcohol.

What are the recommendations for alcohol intake for women?

Limit to 1 drink per day.

What are the potential health benefits of moderate alcohol intake?

Increased HDL and antiplatelet effects.

What negative health risks are associated with alcohol consumption?

Increased risk of breast cancer, pancreatic, liver, and GI health issues.

What is the effect of alcohol on nutrient absorption?

Negative effects on absorption and metabolism of nutrients like thiamin, folate, B12, and fat-soluble vitamins.

What is the significance of thirst in assessing fluid status?

Thirst is not a sensitive indicator; it may not occur until 2% of body weight is lost.

What is the impact of caffeine on hydration?

Caffeine does not dehydrate; its diuretic effects are transient.

What is the importance of adequate water intake?

Prevention and treatment of medical conditions such as kidney stones, constipation, and certain cancers.

What is the role of the liver in alcohol metabolism?

Alcohol is degraded by alcohol dehydrogenase (ADH) in the liver.

What is the recommended limit for alcohol intake for larger men?

1-2 drinks per day.

What are the effects of excessive alcohol intake on the CNS?

It crosses the brain barrier and can have toxic effects, especially during pregnancy.

What is the significance of urine color in assessing hydration?

Pale urine indicates adequate hydration, while dark yellow suggests dehydration.