> but do travel out and walk during weekends.

Traveling somewhere where you walk more and then losing weight is such a common story that it has become a meme.

People also don’t accurately judge how much they eat. The portion sizes were likely smaller and the food composition was different than what you ate in Singapore, even if you thought you were eating the same. A lot has been written arguing about hidden factors in food, but in actual studies it always comes down to eating fewer calories. Eating less calorie dense foods and smaller portion sizes will do it. Even the GLP-1 studies revealed that the magic of their weight loss is directly proportional to reduction of calories eaten, even if patients eat exactly the same foods (but in smaller quantities or less frequently)