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Kenna193 t1_j83vus0 wrote

Physical inactivity is the easier half of the question to answer. Lean muscle mass generally reduces risk of injury, increases bone density, increases bmr, decreases body fat, improves blood glucose levels, and helps with balance. Intense exercise can actually decrease appetite. Exposure to bright light throughout the day (during exercise for example) has also been shown to decrease appetite and increase satiety. Visceral fat can be more common in sedentary life styles and is suspected to cause pro inflammatory compounds and is correlated with many negative health outcomes.

Here is a study that I found after a quick Google that seems to give a better explanation than I have done above.

A piece from the abstract:

>Physical fitness appears to buffer against stress-related disease owing to its blunting/optimizing effects on hormonal stress responsive systems, such as the hypothalamic–pituitary–adrenal axis and the sympathetic nervous system. This blunting appears to contribute to reduced emotional, physiological and metabolic reactivity as well as increased positive mood and well-being. Another mechanism whereby regular exercise and/or physical fitness may confer resilience is through minimizing excessive inflammation. Chronic psychological stress, physical inactivity and abdominal adiposity have been associated with persistent, systemic, low-grade inflammation and exert adverse effects on mental and physical health. The anti-inflammatory effects of regular exercise/activity can promote behavioural and metabolic resilience, and protect against various chronic diseases associated with systemic inflammation. Moreover, exercise may benefit the brain by enhancing growth factor expression and neural plasticity, thereby contributing to improved mood and cognition. In summary, the mechanisms whereby physical fitness promotes increased resilience and well-being and positive psychological and physical health are diverse and complex.

Edit : link

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4142018/#:~:text=Proposed%20mechanisms%20by%20which%20exercise,stress%20%5B30%2C32%5D.

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no_one_in_particle t1_j85q7zb wrote

Also physical movement helps move lymph and blood. Our heart beat pushes blood through the body but blood in the veins and lymph rely heavily on muscle contraction and one way valves.

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DonkeyKong_vs_Animal t1_j87abac wrote

Move lymph?

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no_one_in_particle t1_j8bb8an wrote

Yeah, so a small portion of interstitial fluid (fluid in-between the cells) is pulled into the lymph system. This lymph fluid runs by lymph nodes and such where it is checked for any non-self (virus, bacteria, cancer, etc) things so the immune system can basically take samples of tissue to make sure all is well. This system requires the skeletal muscles and one way valves to help squeeze it through where eventually it dumps back into the blood. It's why you get swollen lymph nodes when you are sick. They have sampled, detected a foreign object, and now have activated to recruit the rest of the immune system to neutralize the threat.

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mhmyfayre t1_j86297y wrote

Do you have a source for the quote on bright light reducing apetite? I am very interested in the qualities of bright light but have not heard this claim before

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