1 Heart-related lung problems. 2  Chest X-rays can show changes or problems in your lungs that stem from heart problems. 3  For instance, fluid in your lungs (pulmonary edema) can be a result of congestive heart failure.
A new report suggests that itâs generally safe for the average person to consume 400 milligrams of caffeine each a day. More than 90 percent of the worldâs population consumes caffeine in some form on a regular basis. The stimulant drug (yes, it is considered a drug) helps a person stay awake, alert and productive.
Healthy Adults. Though it is impossible to recommend a safe range of caffeine intake, most studies show that adults can take in 200 to 300 milligrams safely each day. This is equal to two to four cups of coffee. However, that might be too much for many people, who could feel jittery and on-edge after only one cup.