Increase in weight can be due to a number of causes in addition to intake of heavy meals.
Some common causes of weight gain are:-
Lack of exercise
Doing gym which increases muscle mass
Age related changes.
The urine report you have mentioned shows Albumin
in trace along with 4-5 pus cells. This indicate an Urinary Tract Infection
. Have a Culture and Senstivity test of your urine done in addition to Blood test
for Urea and Creatinine
I hope this will help you. Thanks.