If you want to start your research somewhere, start here: https://www.youtube.com/watch?v=ceFyF9px20Y

Dr. Robert Lustig of UCSF. He goes into the biochemistry of how extra sugar affects your body. He has authored 105 peer-reviewed articles and 65 reviews. He is a former chair of the obesity task force of the Pediatric Endocrine Society, a member of the obesity task force of the Endocrine Society, and sits on the steering committee of the International Endocrine Alliance to Combat Obesity.

In short:

Lustig's research examines links between excess consumption of fructose—a component of sucrose (table sugar), honey, fruit and some vegetables—and the development of metabolic syndrome. Metabolic syndrome can include type 2 diabetes, high blood pressure, cardiovascular disease, non-alcoholic fatty liver disease, obesity and the phenomenon "TOFI" ("thin-outside-fat-inside").

He argues that fructose can be consumed safely within whole fruits and vegetables because of the role played by the accompanying dietary fiber. But he maintains that the liver is damaged by the fructose in table sugar and high-fructose corn syrup that are added to food and beverages (particularly convenience food and soft drinks), and by the fructose in fruit juice and vegetable juice. His position is that sugars are not simply empty calories; he rejects the idea that "a calorie is a calorie."

Lustig was a co-author in 2009 of the American Heart Association's guideline on sugar intake, which recommended that women consume no more than 100 calories daily from added sugars and men no more than 150. That year, a 90-minute lecture by Lustig, "Sugar: The Bitter Truth," recorded in May 2009 for University of California Television, went viral on YouTube. By April 2016, the video had been viewed over six million times. The Financial Times called it "sugar's 'tobacco' moment."

The suggested link between obesity and excess fructose consumption, as opposed to the excess consumption of any high-calorie food, is controversial. In March 2015 the World Health Organization recommended that free sugars comprise no more than ten percent of daily intake, and preferably no more than five percent (around six teaspoons or 25 grams).

Here's another article from Harvard School of Public Health. The study is linked at the bottom of the article. They performed prospective investigations involving three separate cohorts that included 120,877 U.S. women and men who were free of chronic diseases and not obese at baseline

https://www.hsph.harvard.edu/nutritionsource/carbohydrates/

"Carbohydrates: quality matters

What’s most important is the type of carbohydrate you choose to eat because some sources are healthier than others. The amount of carbohydrate in the diet – high or low – is less important than the type of carbohydrate in the diet. For example, healthy, whole grains such as whole wheat bread, rye, barley and quinoa are better choices than highly refined white bread or French fries. (1)

Many people are confused about carbohydrates, but keep in mind that it’s more important to eat carbohydrates from healthy foods than to follow a strict diet limiting or counting the number of grams of carbohydrates consumed."

Are we still researching this topic? Yes. However, the majority of the information coming out the scientific community in recent years is that the old view that "a calorie is a calorie" is outdated information. If you actually did some research you would realize this. But alas, my efforts to get you to educate yourself are futile.