The time when Jia Ling started to gain weight was not explicitly mentioned. The search results mentioned Jia Ling's slim image in the past and her fat image now, as well as the story of her and Qu Ying eating all kinds of Hunan delicacies together, causing her to become fat. However, there was no specific mention of when Jia Ling started to gain weight. Therefore, it was impossible to accurately answer the question of when Jia Ling started to gain weight.
There were many possible reasons for Jia Ling's weight gain. Jia Ling had once said that she became fat because she ate a lot. In addition, there were reports that Jia Ling might have become obese because of taking hormone drugs. There was also a saying that Jia Ling had tried dieting to lose weight, but the result was that she regained her weight and her body was easily allergic. In addition, Jia Ling also said that she became fat because she did a lot of things that she was not good at, which led to increased stress. She released her irritability by eating. In short, there were many reasons why Jia Ling became fat, including eating habits, drug use, stress, and so on.
The reason why Jia Ling became fat was because she was under a lot of pressure while filming the movie Hello, Lee Huanying. In order to relieve the pressure, she used eating to relieve it. She said that she had done a lot of things that she was not good at and was under a lot of pressure. She could only release her stress by eating. She had chosen this type of fatness for her career. It was a proactive fatness that was within her control. Jia Ling's weight gain wasn't due to her failure to lose weight, but because she chose to eat to relieve stress.