Nutrition
Intermittent Fasting: A Complete, Realistic 2026 Guide
Intermittent fasting is a meal-timing tool, not a magic diet: it works when it fits a person's life and goals.
What intermittent fasting really is
Intermittent fasting does not define what to eat, but when. It alternates eating windows and fasting windows. The most popular protocol is 16/8: 16 hours without food and an 8-hour window to eat.
It is not a diet in itself. If calories and food quality do not match the goal, fasting alone produces no magic. Its main value is that, for many people, eating in a shorter window reduces snacking and makes a deficit easier without counting every calorie.
Common protocols
There are several ways to apply it, and the right choice is the one that fits the person's schedule and training, not the most extreme.
16/8
The most used and sustainable: for example, eating between noon and 8 p.m.
14/10
A gentler version, ideal to start or for those who train early.
5:2
Five normal days and two with very low intake; it needs more control.
Real benefits and myths
The best-supported benefit is practical: it simplifies eating and helps control calories without constant mental effort. It can also improve the relationship with late-night snacking.
It is worth dismantling myths: fasting does not burn fat on its own if there is a surplus, it does not dramatically speed up metabolism and it is not required to lose weight. It does not suit everyone: people with a history of eating disorders, pregnant women or those who need steady energy should avoid it or seek advice.
How TrainerStudio helps
If a client wants to try fasting, in TrainerStudio you can set the window as a task, add clear guidelines and schedule reminders so the transition is orderly.
With check-in forms you review energy, sleep, hunger and adherence week by week, and decide whether the protocol works or needs adjusting.