4. Temperature regulation weakens
The body’s ability to manage heat and cold declines.
Neurons in the brain that sense temperature decrease, the skin becomes thinner, and metabolism generates less internal heat.
As a result, older adults often feel cold when others are comfortable or become overheated more easily. Signals for thirst, chills, or overheating also become less reliable, increasing the risk of dehydration, heat exhaustion, or hypothermia.
Overall tolerance to temperature changes drops noticeably.
3. Digestion slows and becomes more sensitive
After 75, the digestive system enters a phase of long-term slowdown.
The body produces less saliva, stomach acid, and digestive enzymes. Nutrient absorption becomes less efficient, and intestinal movement slows, often causing bloating, heaviness, and constipation.
This explains why foods that were once easy to digest may now cause discomfort, gas, or a sensation that food is sitting heavily in the stomach.
This isn’t a sudden food intolerance—it’s a physical change in how the digestive system functions.
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