How Much Caffeine Is OK at Every Age, and When It's Too Much

This is a four part series on caffeine and energy drinks. As a dad of four boys and an ER doctor, here is what I want every family to know. ☕

Part 1: How Much Caffeine Is OK at Every Age

Here is what the agencies that set the limits say.

✅ Adults: the FDA cites about 400 mg a day as an amount not generally linked to negative effects (FDA, Spilling the Beans)

✅ Pregnant or breastfeeding: Health Canada suggests up to 300 mg a day. EFSA in Europe uses 200 mg.

✅ Kids and teens: Health Canada suggests up to 2.5 mg per kg of body weight. EFSA uses about 3 mg per kg. For a 100 pound child, 2.5 mg per kg is about 113 mg.

✅ Energy drinks: the AAP says they have no place in the diet of children and adolescents (AAP, Pediatrics 2011)

Part 2: When Caffeine Is Too Much

In the ER, caffeine overload often shows up as a racing heart and a shaky, jittery feeling.

The FDA lists faster heart rate, palpitations, higher blood pressure, jitteriness, sleep trouble, stomach upset and dehydration in kids and teens who get too much. Energy drink related ER visits doubled between 2007 and 2011, and 1 in 10 ended in a hospital stay (NIH NCCIH). In a 2013 study, 400 mg of caffeine taken 6 hours before bed still disrupted sleep (Drake et al., J Clin Sleep Med 2013).

Red flags: chest pain, fainting, a seizure or a racing heart that will not slow down. Call 911.

Part 3: What Is Actually in That Can

So what is actually in the can? Here is a calm walk through a typical label.

✅ Caffeine: 70 to 240 mg in a 16 oz drink, per the NIH.

✅ Guarana: a plant that contains caffeine, so it raises the total.

✅ Sugar or sweeteners: one 16 oz can may hold 54 to 62 g of added sugar, more than a full day's recommended max (NIH NCCIH). Sugar free versions use sweeteners instead.

✅ Taurine: EFSA found the amounts usually in these drinks did not change the safety of single caffeine doses up to 200 mg.

✅ B vitamins: high doses of niacin can cause skin flushing (NIH ODS).

✅ Ginseng: trouble sleeping is its most common side effect, and it may interact with some medicines (NIH NCCIH).

✅ L carnitine: around 3 g a day has been linked to nausea, cramps and diarrhea (NIH ODS).

If you take any medicine, ask your doctor or pharmacist before adding these.

Part 4: Energy Without the Can

So how do you get energy without one? Often, energy drinks mask a simple problem: not enough sleep.

✅ Sleep: the CDC recommends 8 to 10 hours for teens ages 13 to 18 and 7 or more for adults.

✅ Water: the Dietary Guidelines for Americans say drinks with no added sugar, like water and milk, should be the main choice for kids and teens.

✅ Teeth: in a 2021 lab study, every energy drink tested was erosive to tooth enamel (Silva et al., J Clin Exp Dent 2021).

✅ Alcohol: the NIH says caffeine can make you feel less intoxicated while reaction time stays impaired. In 2011, 42 percent of energy drink ER visits involved alcohol or drugs (NIH NCCIH).

Small steps: a caffeine cutoff, a water bottle, a steady bedtime. My book Quit & Get Rich goes deeper on building habits that stick.

Sources: FDA, Spilling the Beans; Health Canada, Caffeine in Foods; EFSA, Caffeine; AAP, Pediatrics 2011; NIH NCCIH, Energy Drinks; Drake et al., J Clin Sleep Med 2013; CDC, Sleep; USDA and HHS, Dietary Guidelines for Americans; Silva et al., J Clin Exp Dent 2021; NIH ODS, Niacin and Carnitine fact sheets; EFSA, Taurine

Free summary sheet at drzifferblatt.com/caffeine.

Educational only, not medical advice.

Let's Start Your Journey.

Cheers,

Dr. Jocko

Author of Quit & Get Rich https://www.amazon.com/Quit-Get-Rich-21-Day-Rebuild/dp/B0H9JYFSFM

#DrJocko