The practice of intermittent fasting (defined as eating only during a certain time period each day) may reduce blood pressure, improve cognition and reduce chronic diseases. Experts though are not in agreement on who can benefit. Sometimes the benefits are overstated such as reducing insulin resistance and inflammation. Claims that it may effect hormones is not clear either.
Most people try it to reduce weight. Studies have shown that it does have a positive effect on body weight if properly applied over enough time, I.e. six months to really evaluate results. It may be easier to adopt rather than calorie reduction diets. Evidence points to people being able to stick to the regimen for longer periods over low-calorie diets. Adequate protein and weight training is indicated to preserve muscle.
Weight loss helps in reducing visceral fat (abdominal) and positively affects lipid profiles. The parasympathetic nervous system may be affected positively. This is the branch of the nervous system that can help to relax, digest food and lower heart rate. Positive effects take time and show that a reduction of 5% of body weight should see improvements mentioned.
Those who are diabetic or maybe even pre-diabetic should proceed with caution and consult with their physician to adjust insulin medications. Hypoglycemia is something that would need to be discussed and monitored for safety.
Another positive note is that some people report sharper thinking or improved mood but that tends to be anecdotal and not proven in research studies. More study is needed here.
This practice may not be recommended for everyone. Older adults who are frail or women who are pregnant or breast feeding need to be monitored by their health care practitioners as muscle loss my be a real issue for the elderly and proper nutrition for women. Also, people who are obsessed with food may not benefit from intermittent fasting. Consumption of fiber rich foods is also recommended.
This is not a panacea for several medical issues. You will still need proper nutrition and especially hydration to avoid blood pressure issues.
After talking with your health care provider, try this with their recommendations and understand that it may take time (a few weeks to a month) for your body to adapt.