ätfönster

ätfönster is a term used in Swedish to describe the eating window in time-restricted eating, a form of intermittent fasting. It refers to the period during the day when caloric intake is allowed, with the surrounding hours spent in fasting. The length and timing of the ätfönster can vary, but common practice ranges from about 8 to 12 hours of eating per day, plus the remainder of the 24-hour cycle being fasting. Some protocols use shorter windows (for example 6–8 hours) or align the window with daylight hours.

In practice, people choosing an ätfönster select a start and end time that fit their daily routine. Examples include a window from 08:00 to 18:00 or from 10:00 to 20:00. Proponents often emphasize starting earlier in the day to align with circadian rhythms, though adherence and personal preference largely determine effectiveness. Outside the window, only non-caloric beverages, water, tea, or black coffee are typically allowed, depending on the protocol.

Evidence on health effects is mixed. Some studies report modest weight loss and improvements in metabolic markers such as insulin sensitivity and blood pressure, particularly when overall caloric intake is reduced or matched to a goal. Other research finds limited benefits when calories and nutrients are not controlled. Individual responses vary, and adherence, lifestyle, and existing health conditions influence outcomes. Safety considerations include potential for hunger, headaches, or disordered eating, and the approach is generally not advised for pregnancy, certain medical conditions, or individuals with a history of eating disorders.

Terminology and scope: ätfönster is the Swedish label for the eating window concept within time-restricted eating and is commonly discussed in nutrition guidance and popular health media rather than as a formal medical term.