By Dr. Liji Thomas, MD Reviewed by Lauren Hardaker Feb 20 2026 A single junk food ad may not sway adults, but the right 15-second health message can. Researchers reveal how ad length and framing shape cravings differently for normal-weight and overweight viewers, offering new clues for smarter public health campaigns. Study: Length and Framing of Anti-Junk Food Ads Impact Inclinations to Consume Junk Food Among Normal Weight, Overweight, and Adults With Obesity . Image credit: Roman Samborskyi/