I hope that you eat a regular good yogurt, not a diet yogurt. In fact, a diet yogurt does not proof to lose weight. It's true that it does make the person fat from eating ANY diet food and any diet soda because of sugar.
Many diet food products contain Splenda, Suralose, and aspartame. i.e. NutraSweet, Equal, Spoonful, and all those that are artificial sweeteners. These were invented by Monsanto Corporation.
Here are fact sources:
The Truth About Splenda and
Sugar Substitutes—False Promises and Danger
In short, Monsanto won a case from some lawsuits because the company already paid to some congress people doing the dirty business. It is a fake legal for the company to sell them to several restaurants and grocery stores. The Monsanto also invented genetic modified foods (GM) in many foods, and it has no right to take away our food. i.e. corns, some rices, wheat, honey, etc. The company said that GM helps to eliminate bugs on corn fields, but that is not entire true because, in other issue, the farmers still use the DDT spray on the farm. The farmers are not too smart.
Here is the fact:
Genetically Modified Food - What are you Eating?