A personalised diet plan usually involves a lot of experimenting through trial-and-error. The greater challenge is to achieve a diet that you can sustain in the long term with foods that you can enjoy and most conveniently obtain.
Not only does obesity affect one's appearance, more importantly, it increases the risk of developing certain conditions such as diabetes, hyperlipidemia, hypertension, arteriosclerosis (heart disease), fatty liver, infertility etc. Losing weight should not be done solely for vanity purposes, but for health and the prevention of diseases.