When you stand up, your head and shoulders put axial pressure on your spine and cause these sacs to compress. In between your spinal discs there are fluid sacs. Your height actually decreases slightly through the day. If the white line exists, it means the epiphyseal plate has "closed" and no additional bone will grow from the cartilage. The white line means the area is more dense, whereas the dark line from before means it is the less dense, growing cartilaginous tissue. You can see the white line on both sides of the knee, known as an epiphyseal scar. Here is a picture when the "growth plates" are "sealed": These are the epiphyseal plates you are looking for. You can easily see the dark line above both "ankles" or malleoli. Here is a picture of the epiphyseal plates of the distal tibia and fibula in an ankle: When looking at an x-ray of your limbs, look for the line between the diaphysis (shaft of the long bone) and epiphysis (rounded articulation/ where the joint lies). How do I know if my Epiphyseal plates have sealed? ![]() When you're done growing (mostly by the time you're 18-25), your bones ossify, the epiphyseal plates seal themselves, and you stop growing taller and longer. Some people experience growing pains in their bones as they expand. When you go through growth spurts, particularly puberty, they are added onto rather quickly. As you grow, these plates are added onto. Everyone has Epiphyseal plates at the ends of their bones. Scientists haven't narrowed it down entirely, as genes are pretty complex and it's not as simple as it's explained in your general science classes with recessive genes and dominant genes. As of writing this they think it's partly in the X chromosome and chromosomes 7, 8, and 20. They do this for thousands of fraternal twin pairs to determine which parts of their genomes are different. They can then compare the genomes of the twins after they reach their height and see what is different between them. The reason that they're looking at fraternal twins rather than identical twins is that their exact DNA is different but most of the environmental factors are the same (what the mother ate while they were pregnant, probably how they were treated after they were born, etc). They've been doing some research on fraternal twins to try to determine what the specific gene is that determines height. ![]() A good, balanced diet of fats, proteins, and carbohydrates (eat food, not too much, mostly plants) and you'll do fine. It's no guarantee that you'll be taller through eating, but proper nutrition through your formative years can add a bit onto your genetics. Nutrition can slowly cause an increase in height between generations. It’s easy to make this connection between these two long term correlations. The most likely takeaway here is that people who can afford to eat, and eat well, will be taller over generations. Denmark has become one of the tallest countries in the world, and its rise in height is strongly correlated to its wealth per capita. In Japan after the war, the population had access to more fish protein and the average height of the country increased three inches. There is some indication that getting enough protein through your developmental years can add to your height positively.
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