Fasting trend gains popularity

Across social networks, the idea of fasting for 12 hours to burn more fat is attracting attention, especially among those seeking weight loss. This trend is promoted through posts, videos, and podcasts, suggesting that skipping meals or eating earlier can lead to better fat burning.

Expert highlights risks

Pharmacist Javier Fernández Ligero explains that while fasting can shift the body's energy source, it is not without risks. He emphasizes that this shift may not be safe for everyone, particularly those with certain health conditions or dietary needs.

Glycogen and energy use

The concept of fasting relies on the body's use of glycogen, a stored form of sugar found in the liver and muscles. According to Fernández Ligero, after 12 hours of fasting, the body begins to deplete these glycogen reserves, switching to fat as an energy source.

Metabolic shift explained

When glycogen stores are low, the body starts using fatty acids for energy. However, muscle glycogen remains available for physical activity. The longer the fasting period, the more the body relies on fat stores, which can lead to weight loss over time.

Stages of fasting

A fast progresses through several stages. From 0 to 4 hours, the body digests the last meal and stores sugar. From 4 to 12 hours, it uses liver glycogen to maintain blood sugar levels. After 12 hours, the body shifts to using fat as its primary energy source, a process known as ketosis.