A recent study published in PNAS has shed new light on the age-old debate about weight gain and calorie intake. For years, the conventional wisdom has been that “it’s just calories in, calories out.” However, a new study reveals that ultra-processed foods (UPFs) may be contributing to weight gain, despite being matched for macronutrients.
The study found that participants who consumed UPFs gained weight, even when their overall calorie intake was controlled. This suggests that the high-calorie content of UPFs may be the culprit behind weight gain. However, some critics argue that this finding reinforces rather than challenges the traditional calories-in/calories-out paradigm.
One key point to consider is that exercise levels were held constant across all groups. This raises an important question: if individuals consuming more calories still gain weight, does that mean they require more exercise? Or is it possible that consuming more calories while engaging in regular physical activity may not be enough to offset the caloric content of UPFs?
The study’s findings also highlight a broader issue – the way we think about willpower and personal responsibility when it comes to food choices. The author suggests that gaslighting people into thinking their weight gain is solely due to lack of self-control is misleading. This narrative implies that individuals have agency over their dietary choices, which may not be the case.
Ultimately, this study highlights the need for a more nuanced understanding of weight gain and calorie intake. While traditional diets may still be effective for some, it’s essential to consider the impact of ultra-processed foods on our health. By recognizing the limitations of the calories-in/calories-out paradigm and acknowledging the role of UPFs in weight gain, we can work towards a more informed and compassionate approach to food choices and body image.
Source: https://www.dailykos.com/stories/2025/7/15/2333552/-Calories-In-Lies-Out-Ultra-Processed-Foods-Shatter-the-Old-Weight-Loss-Rules