Eating once a day is called OMAD (One Meal a Day). It is an extreme form of intermittent fasting. For some people it leads to weight loss, but it also carries real risks and is not a good fit for most lifestyles.
OMAD can work, but it is one of the hardest eating patterns to sustain and not the healthiest option for most women.
How OMAD Works
When you eat only once a day, your body spends most of the day in a fasted state. During this time, insulin levels drop and your body shifts to burning stored fat for energy. You also naturally reduce total calorie intake because it is hard to eat a full day’s worth of food in one sitting.
Some people find OMAD simple because there are no decisions to make throughout the day. Others find it leads to intense hunger, irritability, and difficulty concentrating by the time their one meal comes around.
Potential Benefits of OMAD
- Calorie reduction: Hard to overeat when you only have one meal window
- Simplicity: No meal prep or planning for most of the day
- Fat burning: Extended fasting periods may increase fat burning
- Blood sugar stability: Some people report fewer cravings after adapting
Limitations and Risks You Should Know
OMAD makes it very hard to get enough protein, vitamins, and minerals in a single meal. Nutrient deficiencies are a real risk over time. Muscle loss is also more likely when you fast for 23 hours and then try to eat enough to preserve lean mass.
Many people experience extreme hunger, headaches, low energy, and trouble sleeping. Women in particular may experience hormonal disruption from severe calorie restriction patterns like OMAD.
People with diabetes, a history of disordered eating, or who are pregnant should avoid OMAD entirely. Always check with a doctor before starting this type of eating pattern.
Tips If You Want to Try Intermittent Fasting
- Start with 16:8 fasting (16 hours fasted, 8-hour eating window) before trying OMAD
- Make sure your one meal is packed with protein, vegetables, and healthy fats
- Stay hydrated throughout the day with water and herbal teas
- Stop immediately if you feel dizzy, weak, or extremely fatigued
- Consider 2-meal-a-day approaches as a safer, more sustainable middle ground
Helpful Tools
- BMI Calculator – Know your starting point before changing your diet
- Body Shape Calculator – Understand your body and set realistic goals
Quick FAQs
Will eating once a day cause muscle loss?
It can. Without regular protein intake, your body may break down muscle for energy, especially during workouts.
Is OMAD better than regular intermittent fasting?
Not for most people. Standard 16:8 intermittent fasting is easier to maintain and carries fewer nutritional risks.
How long does it take to see results with OMAD?
Some people see weight loss in 1 to 2 weeks, but results vary widely and are not always sustainable long term.
This article is for informational purposes only. It is not medical advice.
Written by Body Shapers, Certified Fitness & ShapeWear Advisor
Reviewed for accuracy. Not a substitute for professional advice.