I was reading your blog ,then this post, after some search for cinesongs and raga etc. A small correction on the above post, sorry for being so picky but I am very health conscious and want to correct.
In your post , everything is correct except that you described that urad dal is fatty. Not true. Actually it is protein. If you do exercises then urad dal is the one that helps you to build lean muscles . Rice part of idly is the carbohydrate if unspent, can become fat or block your arteries.

Then Vadai is even more better but vadai contains so much oil (colostral) that it is very unhealthy. And if your calorie intake is well within the daily requirement (2500kcalories), then you donot have to worry about the rice part of idly.