Experts have also found that restricting food intake during the day can help prevent health problems such as high cholesterol, heart disease and obesity, as well as improve mental health and well-being. Apr 20, 2020 (SOURCE: AL JAZEERA).
1.The most recent study on Ramadan and mental health is in 2021.The study was cross sectional and retrospective on the number of hospital admission during Ramadan.
2.There is also a paper on the meta analysis in 2018.
The Prospective Cohort study upto date known to me is in 2015:
Abdul Aziz Farooque etal. J Acad Nutr Diet. June 2015.
For mental health fasting prevented, forbidden by medical staff usually. Depends of types and condition. Fasting doesn't help cholesterol either neither god for diabetes patients.
For cholesterol, it's not Ramadan fasting soully for. For colestorol it's appropriate category of food intake, Saturated/unsaturated fatty acids needs taken care of, therefore, education on basic food must be for all human.
Fasting and Ramadan, majority Muslims ends up eating extra and rich greedy/ oily over fried in burnt oil, for making celebrations. For cholesterol is the saturated fatty acids needs to be taken are of, there Muslims mustn't treat Ramadan as a celebration it is an ordered Lent month, faith ways.
Lent is for to be easy on food to have control and and Ramadan is trial of that.
Ramadan fasting of course helps strengthening metabolism, immunity as well as spriritual strengthening.
We Muslims do fast Ramadan for order in Quran as the main purpose not for weigh loose programme. Food is the vital problem like water, people dying because of too much or too little and by its contamination.
Certainly fasting is ideal for food obsessives. There for Ramadan is ideal deciplining month of course.