Talk to your doctor then, also read Obesity Code by Dr Fung it has some good pointers.
I would say start slowly do 12 hour fast one day, 14-16 the next and etc.
Supplement your electrolytes. I use Hi Lyte
Hi-Lyte Electrolyte Concentrate for Immune Support and Rapid Rehydration (3 Bottles) | NO Calories, Sugar or Additives | Magnesium, Potassium, Sodium & Zinc | 144 Servings https://www.amazon.com/dp/B073KQZ4XL/ref=cm_sw_r_cp_api_i_RCX6MSYH9GZY2R1QJG38?_encoding=UTF8&psc=1
And magnesium, potassium and calcium and multi.
You can still take your meds generally speaking under 25 calories doesn’t break fast.
Fasting can cause gallstones, to avoid those add juice of fresh lemon to your water and take a bile supplement.
I use this
Standard Process A-F Betafood -... https://www.amazon.com/dp/B073YDN557?ref=ppx_pop_mob_ap_share
I am not a doctor.
This book has a ton of research and citation for many of the things you inquire (how hormon levels change, how longevity is affected, how diseases can be prevented and in some instances cured)
According to this book, there were studies conducted in the former Soviet Union where asthma sufferers significantly benefitted from prolonged fasts. The Russian researchers Osinin and Kokosov were experts in the field of bronchial asthma and observed 10,000 patients during prolonged fasts.
Try supplementing with this, it increases bile production lowering concentrations that could lead to gallstones:
Standard Process A-F Betafood -... https://www.amazon.com/dp/B073YDN557?ref=ppx_pop_mob_ap_share
Before I used it I felt pain in my gallbladder during fasts and now it completely cleared up.
Likely not. I know people are super concerned for your safety, and rightly so :) no one wants to be the one to just say yes go for it. Anyway, just please make sure you are eating enough calories and a proper variety of nutrients. As long as you do that and don't go beyond a 16:8, you will be fine.
In fact, some of the research on fasting mentions as a pre-hypothetical anecdote about how whole families in the earlier to mid 1900s, including children, ate their 3 square meals a day within 8-10 hours of each other, no snacking (think 1950s). And this likely contributed in part to lower obesity levels. Again with proper calorie intake and nutrient acquisition, you should be fine.
Sorry if this is a little rambly... just woke up, it's 5am lol (and I'm on Reddit.. haha)