McDonald’s and KFC have drawn attention after a WorldAtlas ranking on the unhealthiest fast-food chains resurfaced online.
The list first appeared in June 2025 and was later carried by Yahoo, rather than coming from a new 2026 scientific study. WorldAtlas said it reviewed nutrition data, menu “gimmicks” and marketing tactics at US chains. It was an editorial ranking, not peer-reviewed medical research.
Wendy’s topped the list, followed by Sonic, Taco Bell and Dairy Queen. KFC ranked fifth, Quiznos sixth and McDonald’s seventh. Smashburger, Little Caesars and Chick-fil-A completed the top 10.
Calories, Sodium and Saturated Fat Drive Rankings
The assessment focused on calories, sodium, saturated fat and oversized meal combinations.
WorldAtlas said many signature meals can approach or exceed daily nutritional limits in one sitting. It described KFC buckets as “calorie, fat and sodium bombs disguised as comfort food.”
The report estimated that a three-piece KFC Extra Crispy combo with a biscuit and mashed potatoes contains about 1,300 calories. It also listed roughly 2,900 milligrams of sodium and 22 grams of saturated fat.
Read More: From Breakfast Cereals to Ready Meals: WHO Prepares Guidance on Ultra-Processed Foods
McDonald’s received criticism for large meals. WorldAtlas said a Big Mac meal with large fries and soda can exceed 1,300 calories. A Double Quarter Pounder combo may approach 2,000 calories.
Little Caesars ranked ninth because of large portions. The report estimated that one Hot-N-Ready pepperoni pizza contains about 2,140 calories and 4,260 milligrams of sodium.
Burger King Ingredient Claims Need Context
The renewed coverage also highlighted Burger King, although the chain did not appear in the WorldAtlas top 10.
Separate reporting raised concerns about potassium iodate in some buns. Critics noted that some countries restrict the flour treatment agent over potential thyroid concerns. They also linked mono- and diglycerides to gut inflammation.
Burger King’s chicken products use processed coatings, seasoned batters and frying oils that may contain dimethylpolysiloxane, an anti-foaming agent. Some products contain silicon dioxide, which prevents powdered ingredients from clumping.
However, regulatory context matters. The US Food and Drug Administration lists potassium iodate for dough strengthening and flour treatment. It permits dimethylpolysiloxane for certain defoaming uses and identifies silicon dioxide as an anti-caking agent.
An approved additive’s presence alone does not prove that a food causes harm. The stronger concern involves frequent intake of calories, sodium, free sugars and unhealthy fats.
The World Health Organization recommends less than 2,000 milligrams of sodium daily for adults. It also advises limiting saturated fat to 10 percent of total energy intake.
WHO says diets rich in highly processed foods are associated with negative health outcomes. Such products often contain refined seed oils, added sugars, preservatives and emulsifiers to improve taste, texture or shelf life.
Frequent consumption may contribute to unhealthy weight gain, high blood pressure, heart disease, diabetes and other chronic conditions. Smaller portions, fewer sugary drinks and nutrition-label checks can reduce risk.
