system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:What happens in our bodies during the acclimatization process?

Our bodies constantly adapt to handle temperatures in summer/winter, how does that process work? And can the body adapt to extreme cold and extreme heat at the same time?
gpt
Cell membranes are made up of different types of fatty acids. Some fatty acids can be packed more than others, therefore affecting their melting point. Think of butter and oils; butters are mainly solid (compact, saturated fats), while oils are mainly liquid (less compact, unsaturated fats). Now our cell membranes must maintain a proper fluidity to function, so they have the ability to change the types of fatty acids over time. When it is cold, the cell membrane is consists of more fatty acids that compact less. Think of how hard butter is when it is cold; now imagine your cell membranes are too hard! When it is hot, less compact fatty acids create a membrane that is too fluid. This would cause an improper shape, so the membrane begins to incorporate the compact fatty acids. So basically, hot —> more compact fatty acids; cold—> less compact fatty acids.