I found something to calculate weight category (underweight or normal weight or overweight or obese). According to this thing my weight is normal. I eat only healthy stuff and I eat only once a day.

YOU NEED TO CLICK THIS - Calculate Your Body Mass Index

Body mass index (BMI) is a measure of body fat based on height and weight that applies to adult men and women. 

• Enter your weight and height using standard or metric measures. 
• Select "Compute BMI" and your BMI will appear below. 

Español Your Height:  (feet) (inches) Your Weight:   (pounds) Your BMI: BMI Categories:  Underweight = <18.5 Normal weight = 18.5–24.9 Overweight = 25–29.9 Obesity = BMI of 30 or greater  The BMI Tables Aim for a Healthy Weight: Limitations of the BMI Assessing Your Risk Controlling Your Weight Recipes Download the BMI calculator app today (available for iPhone and Android).