One meal a day (OMAD) or once a day is now a trending diet method, especially on TikTok. This method is claimed to lose weight quickly, without having to calculate calories or limit the type of food.
However, along with the increasing number of people who have carried out this trend, there are also concerns about health in doing so. Quoting from Healthline, on Sunday, June 22, 2025, OMAD is a form of intermittent fasting, known as the 23:1 method.
On this diet, a person fasts for 23 hours and only has a dining window for one hour. Thus, the perpetrators of this diet only consume one big meal every day, which is usually done at night and does not consume calories outside of that watch.
The advantage of OMAD is the ease of doing it. No food is prohibited and no need to count calories, it's enough to arrange just meal times.
Several small studies also showed promising results for the diet trend. Research in 2022 states that eating once a day at night can help lose weight and increase fat oxidation during exercise.
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However, the OMAD diet method is also not without risk. Limiting extreme meal times by just one hour a day can cause a number of side effects on the body, as follows.
1. intense hunger.2. Lemas, dizziness, and difficulty concentrating due to blood sugar fluctuations. 3. Fatigue due to lack of energy intake. 4. Increase the risk of unhealthy eating behavior, such as binge eating.
With this risk, the OMAD diet is actually not recommended. Especially if the person who does it has a lot of activity in his daily life.
Karena Anda mengeluarkan lebih banyak energi, berarti Anda membutuhkan lebih banyak makanan. Ini adalah salah satu alasan mengapa tidak merekomendasikan diet ini, karena dapat menghambatkan faktor-factor lain yang membentuk gaya hidup sehat, kata ahli nutritionist, April Morgan.
In addition, a scientific review in 2023 also states that such an extreme diet can cause psychological stress and eating disorders. This most likely happens to those who tend to experience emotional stress while on a strict diet.
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