The general consensus from health experts is that consuming more than about 400 mg of caffeine per day is considered too much for most healthy adults. Since energy drinks often contain around 80 mg of caffeine per 8-ounce serving, but cans are frequently larger (16-24 ounces) and may contain additional caffeine sources like guarana, it is easy to exceed this limit by drinking multiple energy drinks in a day

. Key points on how many energy drinks are too many:

• Limit energy drink intake to no more than 16 ounces (about one standard can) per day to avoid excessive caffeine

• Consuming two or more energy drinks daily can easily double or triple your caffeine and sugar intake, increasing risks of heart problems, type 2 diabetes, obesity, and metabolic syndrome

• Drinking nearly 1 liter (about four cans) of energy drinks in a short period can raise blood pressure and cause heart rhythm disturbances, which may be dangerous

• Pregnant or nursing women, children, and teenagers should avoid energy drinks altogether due to health risks

• Overdosing on energy drinks is rare but possible, with symptoms including heart palpitations, anxiety, and in extreme cases, hallucinations or arrhythmias

Summary:
For most adults, drinking more than one standard energy drink (16 ounces) per day is too many due to the risk of excessive caffeine and sugar intake and potential cardiovascular effects. It is best to limit consumption to one can per day and avoid mixing with other caffeine sources. Vulnerable groups should avoid energy drinks entirely