That is missing meals and only having half meals when you do eat.
Because your body will decide that there is going to be a famine for whatever reason and so will store whatever carbohydrates and fat are in the food you DO eat and store it as fat for possible future starvation.
Water is essential for living. You can live for about 3 weeks without food, but only about 7 days without water.
Alcohol especially beer will make you put on weight because it is full of calories.
Also, not drinking enough water could make you constipated. This will make you feel bloated, sluggish and your metabolism will slow down, resulting in the food you do eat being unable to get away from you and will store as fat. The faster your metabolism, the quicker your waste will be evacuated from your body and not get a chance to hang about as fat.
If you are really determined that you DON’T want to lose weight. Be sure to eat lots of food containing carbohydrates.
Salt will help you in your mission NOT to lose weight.
Now you know how to sabotage your own body and self-destruct.