Overconsumption of which nutrient type is most likely to increase body fat?

Overconsumption of processed carbohydrates and simple sugars is most likely to increase body fat due to several factors related to how these nutrients are metabolized and their impact on the body's insulin response. Processed carbohydrates often have a high glycemic index, leading to rapid spikes in blood sugar levels. This spike stimulates the release of insulin, a hormone that not only helps to lower blood sugar but also promotes fat storage. When sugar intake exceeds what the body needs for immediate energy, the excess is converted to fat for storage, contributing to increased body fat over time.

Additionally, processed carbohydrates are often low in essential nutrients and fiber, which means they can lead to feelings of hunger and increased caloric intake overall. When individuals consume more calories than they expend, whether from processed carbs or any other source, the excess calories can lead to weight gain.

In contrast, healthy fats can be satiating and contribute to a feeling of fullness, which may lead to lower overall calorie consumption. Complex carbohydrates typically contain fiber and nutrients that can also promote fullness and are generally digested more slowly, making them less likely to cause significant spikes in insulin. Protein is essential for building and repairing tissues and can enhance satiety as well, which also helps to manage overall body fat levels.