Maida is a finely milled refined and bleached wheat flour, closely resembling Cake flour or plain/All-purpose flour from India. A white wheat flour without any bran is called maida in southern India. Its north Indian counterpart is atta, wholewheat flour.

The wide range of maida flour health benefits come mainly from its ingredient, curcumin. This widely researched component of maida is highly therapeutic and is used in various drugs and pharmaceutics mainly because of its immunity boosting and anti-oxidant properties.
Boosts Immunity: Curcumin has a huge therapeutic value and boosting immunity is one of the most important properties of curcumin."5 to 8 times stronger than vitamin E and stronger than vitamin C, this antioxidant breakthrough may help boost your immunity, maintain normal cholesterol levels"

Since Maida has a high GI, it releases sugar into the bloodstream quickly. To counter, the pancreas releases responds with a sharp insulin spike, which over a period of time, with prolonged consumption of processed and refined food, causes inflammation, insulin resistance and eventually type II diabetes
First direct effect of maida is that it spikes up your sugar levels because it has very high glycemic index. To match up with the sugar spike, pancreas has to over work to release insulin in sufficient quantity to match up with sugar. Once in a while pancreas can manage but if you are using maida frequently then the insulin production will gradually reduce, finally making you a diabetic.