system
Given the following post, respond as if you're commenting on Reddit:
human
Do picked fruits increase calories as it ripens?

Fruits gets sweeter as it ripes but does it increase in calories? For example, unripe bannana vs ripe, latter being much much sweeter.  But if thats the case where does it get the energy since its picked?  thanks!
gpt
From a physics point of view, no, the calorie content does not increase. A calorie is a unit of energy, and the law of conservation of energy states that the total energy of an isolated system will not change. But from a nutritional perspective, a ripe fruit would have more calories from simple sugars, which are easier for our bodies to absorb and digest. An unripe fruit would have a higher content of dietary fiber, which would just pass through our digestive tract undigested. As the fruit ripens, many of the polysaccharides that make up the fiber will be broken down into the simpler sugars that we can actually digest. 

So the short answer is that a ripe fruit has the same amount of energy, but a higher ratio of energy that our body can use or store.