The Oort cloud is thought to be spherical because it is believed to be composed of icy objects that were gravitationally drawn together by the Sun's gravity when the solar system was forming. Its spherical shape is also likely due to the fact that it is composed of particles in random orbits, which generally tend to form a spherical shape due to their chaotic orbits.

1. Poor nutrition: Long-term physical inactivity and social isolation can lead to poor nutritional choices, which can lead to chronic health diseases.

2. Lower immunity: Social isolation and physical inactivity can cause a weakened immune system, which can make a person more vulnerable to disease.

3. Hormonal imbalances: A lack of physical activity and social activity can cause hormonal imbalances in the body, which can lead to chronic health conditions.

4. Stress: Prolonged periods of physical inactivity and social isolation can lead to increased stress levels, which can have negative impacts on physical and mental health.

5. Disrupted sleep: Long term physical inactivity and social isolation can lead to changes in the body's circadian rhythms, which can disrupt the body's natural sleep cycle and lead to chronic health issues.