What is the OMAD diet? Is this trending food fix the New Year weight loss shortcut you should really try?

As the calendar turns and fitness resolutions gain momentum, one eating pattern is once again finding its way into conversations around weight loss. Known as the OMAD diet, or One Meal A Day, the approach promises simplicity and fast results. But as interest grows, health experts and recent reports suggest the reality may be more complex than the trend implies.

What is the OMAD diet and why is it trending now

OMAD is a form of intermittent fasting where a person consumes all daily calories within a single meal, typically over a one hour window, followed by a 23 hour fast. The diet often resurfaces around the New Year, when people look for structured resets after weeks of festive eating. Its appeal lies in its clarity. No calorie counting across the day, no multiple meals, just one plate and a long fasting stretch.

Healthline, which has closely tracked intermittent fasting research, notes that OMAD represents one of the most extreme versions of time restricted eating, far more restrictive than popular methods like the 16:8 plan.

Does eating one meal a day actually help with weight loss

Weight loss under OMAD usually occurs because people end up consuming fewer calories overall. A 2022 study cited by Healthline found that limiting food intake to a short evening window led to greater short term reductions in body fat compared to eating three meals daily.

However, researchers also stress that OMAD is not necessarily more effective than traditional calorie reduction methods. Earlier reviews suggest intermittent fasting in general can support weight loss, but eating just one meal a day offers no clear advantage over balanced, less restrictive plans.

The hidden metabolic risks experts are flagging

While the promise of rapid results can be tempting, studies raise concerns about how the body responds to prolonged daily fasting. A 2019 study highlighted that skipping meals, especially breakfast, may impair glucose control later in the day and could increase the risk of type 2 diabetes.

Healthline reports that eating one meal a day has been linked to higher fasting blood sugar levels, delayed insulin response, increased hunger hormones and in some cases, loss of lean muscle mass. This muscle loss is associated with a higher risk of metabolic and cardiovascular conditions over time.

When extreme restriction backfires

People who try OMAD often report fatigue, irritability, low energy and difficulty concentrating. Eating enough nutrients in a single meal can also be challenging, increasing the risk of deficiencies. Experts warn that for some individuals, the structure of OMAD may encourage disordered eating patterns or cycles of overeating during the lone meal.

Research reviewed by Healthline also suggests that this approach may not be suitable for pregnant or breastfeeding individuals, older adults, people with diabetes or those with a history of eating disorders.

What health bodies recommend instead

Rather than extreme resets, public health guidance continues to favour gradual change. The UK National Health Service advises focusing on balanced meals, portion control and regular physical activity. Two or three nutrient rich meals spread across the day appear to support metabolic health more consistently than a single daily intake.

Healthline concludes that while fasting may offer certain benefits, eating one meal a day is unlikely to be the healthiest or most sustainable route for most people. For those considering OMAD, consulting a healthcare professional is strongly recommended before making it a New Year commitment.