Presentation on theme: "By Charlene Friesen and Tiffany Kirk"— Presentation transcript:
1 By Charlene Friesen and Tiffany Kirk CaffeineBy Charlene Friesenand Tiffany Kirk
2 What Is Caffeine?Occurs naturally in some substances, like coffee beans, teas leaves, cocoa beans, guarana and mate.Its pure form is a white, bitter, crystal powder that is isolated from decaffeinating coffee and tea.Classified as both a psychoactive drug and a food.
6 How much caffeine is consumed? 80 to 90% of North Americans consume caffeine everydayThe average North American consumes mg per dayA safe dose is 300mg/day (3 cups coffee)Over 600mg per day is considered excessive (more than 4 cups of coffee or 15 cups of tea)A lethal dose is 7,500-10,000mg ( cups of coffee)
8 How Does Caffeine Work in the Body? It interferes with the calming effects of the neurotransmitter adenosine. It causes a release of epinephrine, dopamine, serotonin which are the excitatory neurotransmitters. This makes your body think this is an emergency, and your body responds by:Pupils dialateAirways dialate to increase oxygen capacityHeart rate increasesExtremities get cold as surface blood vessels contract to carry blood to muscle and brain
9 Blood pressure risesBlood to the stomach, bladder and intestines slowsLiver releases glycogen for extra energyMuscles contract for actionWhen the effects of caffeine wear off, adrenaline wears off, and you feel tired or depressedIt stimulates the pleasure centers of the brain, causing addiction using the same channels as amphetamines, cocaine and heroin, but with less effect
10 Caffeine’s half life is six hours, so that a coffee containing 200mg of caffeine consumed at 3pm will still have 100mg caffeine in your bloodstream at 9pm and be fully excreted at 3 amCaffeine reaches its peak concentrations in your body within 30 to 60 minutes after consumption
11 What are the side effects of Caffeine? THE GOOD…May protect against diabetesEnhances alertnessEnhances physical performance and enduranceIncreases efficacy of certain pain killersMay reduce colon cancerIncreases metabolismFewer suicides noted in those addicted to caffeine
12 THE BAD….Mild diuretic causing dehydrationCardiac and nervous stimulantCauses addictionPrevents deep sleep and causes insomniaHeadacheAnxietyIncrease risk of miscarriage, birth defects and low birth weightIt crosses into breast milk and effects babies negativelyCauses calcium depletion from the bonesIncreases sensitivity to pain
14 Addiction and Withdrawal You are considered addicted to caffeine if you feel that cannot functionwithout it, and must consume it everydayWithdrawal symptoms include headache, irritability, nervousness, restlessness and exhaustion. In extreme cases, nausea and vomitingSymptoms begin within hours after discontinuing caffeine usage, and peaks after hours
16 How Can I Quit?Caffeine Fading: reducing the amount of coffee by about ½ cup per day. Make sure you have other beverages available, like herbal tea, but do not drink decaff coffee, as it is also addictive.Cold Turkey: The withdrawal symptoms can be painful this way, but can be counter-acted by lots of sleep and exercise. Or, drink a coke if you just can’t take it.
17 Caffeine SurveyHow much caffeine do you typically consume a day?
18 Typical Amounts of Caffeine Brewed Coffee: mg/200mlInstant Coffee: 64mg/200mlEspresso/cappuccino/latte:30-50mg/2tbsp or about mg/ mugTea: 40-70mg/200mlColas: 50mg/canJolt: 70mg/can* Barq’s root beer: 25.4 mg/canChocolate milk: 50mg/250mlChocolate bar: 30mg/barTylenol #3: 45mg/tabletExcedrin: 65mg/tabletPep Pill: mg/pill