The film is basically about a fat girl, who puts her parents in distress as they often fail to find her a suitable bridegroom. Obviously, the problem here is her overweight.
The character of Anushka is learnt to be that of a village girl, who is getting ready for her marriage. But every time, the marriage process begins, some problem shells because of her weight and size. How she rectify her obesity problem is the main plot.
Inji Iduppazhagi also showcases the day-to-day life issues faced by an obese girl and that’s about it. The film then narrates the efforts taken by her to lose weight, and that comes with a social message.