Ultra-Processed Food causes an increase in calorie intake and weight gain. Here’s how

Reference Paper: Ultra-Processed Diets Cause Excess Calorie Intake and Weight Gain: An Inpatient Randomized Controlled Trial of Ad Libitum Food Intake

Too lazy to read? There’s an infograph at the end of this article!

Ultra-processed food like donuts, chips and burgers tend to be diet-hurting. Ads use words like “Say goodbye to your diet!” when they promote a new processed dish, often calorie heavy like a heavily frosted cake, and with good reason. It doesn’t help that ultra-processed food are often cheaper, tastier, and more convenient to purchase, making it the more attractive choice.

While every diet in the world may while one way or the other be disadvantageous in its own method, they often have one common factor: Choose as much whole food as possible!

A recent paper by Professor Kevin Hall and his team addressed the issue by having 10 males and 10 females come together to enjoy either an unprocessed or ultra-processed diet for two weeks, and then have the alternate for another two weeks. During each diet phase, the individuals were given three daily meals and were instructed to consume as much or as little as desired.

During the study, the researchers found that participants gained 0.9 ± 0.3 kg during the ultra-processed diet and lost 0.9 ± 0.3 kg during the unprocessed diet. While the results seem obvious (They ate ultra-processed food, what were they expecting?!), it’s more important to understand the why too.

1. Individuals ate more in the ultra-processed diet compared to the unprocessed diet

The average amount of food individuals ate was 508 ± 106 kcal/day more during the ultra-processed diet compared to the unprocessed diet. This meant that during this study, individuals were gaining weight because they were consuming more food, and not because ultra-processed food had some unicorn magic causing their food to increase the weight of the subjects.

It is also interesting to note that most of the increased calories consumed by individuals was from carbohydrates and fats, while protein remained unchanged.

2. Individuals tend to consume ultra-processed food faster

It was noted in the study that meal eating rate was significantly faster during the ultra-processed diet compared to the unprocessed diet. According to the research paper, previous studies have shown that a 20% change in eating rate can affect food consumption by 10-13%, which would directly contribute to the number of calories you put into your body.

An explanation behind why individuals seem to eat faster during the ultra-processed diet was because food was generally softer, and therefore easier to chew. The increased in eating rate therefore allowed more food to enter the body, and the body might not have registered that it is being fed, thus causing more food to enter.

3. Hormones meant to suppressed appetite decreased while hormones signalling hunger increased during the ultra-processed diet

The appetite-suppressing hormone PYY increased and hunger hormone ghrelin decreased during the unprocessed diet as compared with both the ultra-processed diet and baseline.

This meant that during the ultra-processed diet, there is a higher potential that the body had a higher appetite level and felt hungrier compared to when it was being fed an unprocessed diet. The result of this might have caused an increase in how often and how much we decide to eat.

Does this mean that we should stop eating ultra-processed food altogether?

Yes, and no. While it is possible for some to do so, others may feel a sense of deprivation when they do not get to eat their favorite food. What seems bad for the body may after all, be good for the brain. If you intend to enjoy a serving of your favorite cake after this, just be mindful about what you’re putting into your body and consider the effects. This way, you can practice mindfulness while enjoying some of your favorite things in life. Double win!

Here’s an infograph to help you grab the main points of the study!


Hall, K., Ayuketah, A., Brychta, R., Cai, H., Cassimatis, T., & Chen, K. et al. (2019). Ultra-Processed Diets Cause Excess Calorie Intake and Weight Gain: An Inpatient Randomized Controlled Trial of Ad Libitum Food Intake. Cell Metabolism. doi: 10.1016/j.cmet.2019.05.008

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