Caffeine is the world’s most popular psychoactive substance, and unlike most it comes with a clear safety dossier. The European Food Safety Authority reviewed the evidence and set four hundred milligrams daily as the level not associated with harm in healthy adults, with two hundred milligrams as the single dose and pregnancy ceiling.

What the Budget Buys

A brewed coffee carries roughly ninety five milligrams, an espresso shot sixty three, black tea forty seven, a cola thirty four and a typical energy drink eighty. Four coffees already exhaust the adult allowance. Coffee shop sizes complicate matters, since a large chain latte may hold two or three shots, and cold brew concentrates can double the per cup figure.

Pregnancy Changes the Math

Caffeine clearance slows dramatically during pregnancy, and the compound crosses the placenta freely while the fetus cannot metabolize it. Guidance from major bodies therefore halves the limit to two hundred milligrams. Energy drinks add another wrinkle through their sugar load and extra stimulants, which is why many clinicians advise skipping that category entirely during pregnancy.

Signs the Budget Is Blown

Jitteriness, racing heart, anxiety and especially fractured sleep are the early bills. Because caffeine’s half life runs five to six hours, an afternoon coffee still circulates at bedtime, and poor sleep then drives the next morning’s extra cup, a loop worth breaking at the timing end rather than the quantity end.

Sensitivity varies genetically, so some people thrive at four hundred while others feel wired at one hundred. The numbers are ceilings, not targets.

References

• EFSA Scientific Opinion on the Safety of Caffeine
• FDA Spilling the Beans on Caffeine