The immune system also includes bone marrow, a soft tissue found in the bones of your arms, legs, pelvis and spine, that produces white blood cells to protect you against infection and promote the healing of damaged cells after injury and trauma , and the spleen which filters your blood to remove old or damaged blood cells .
The migration of white blood cells to areas of injury and cell damage is a necessary part of the acute inflammatory process that is essential to a healthy functioning immune system. But keep in mind that all cells of the body have a limited life span and will age and become less functional over time. However, when white blood cells become less functional, your immune system can be compromised interfering with your ability to heal and making you more prone to infection.
Water only fasting redirects body cells away from growth, promoting repair, maintenance and healing. When growth is inhibited in water only fasting, the process of autophagy is increased. Autophagy directs the body to recycle the damaged parts of old worn out cells and remove and/or repair damaged cells. So that after just 4 days of water only fasting there is a remarkable stem cell activation and production of new functional white blood cells which enhances and reboots your immune system.
In the UK, fasting and a follow up plant-based diet significantly resolved the complications and laboratory markers associated with RA. After four weeks, a test group that completed a 7-10 day water-only fast, followed by a gluten-free, plant-based vegan diet, had a significant decrease in the number of swollen joints, a decrease in the duration of morning stiffness, an increase in grip strength, and a remarkable decrease in the bio-markers for inflammation and RA, including erythrocyte sedimentation rate, C-reactive protein and white blood count.
Keep in mind that your body, in its wisdom, knows what belongs in it and what does not. And during a water-only fast, it will eliminate what it needs least to support what it needs most. So for example, it needs vital organs like heart, brain, kidney, liver etc. but it does not need tumors, cysts, stones and growths.