“Breakfast is the most important meal of the day.”
Moderate confidence because randomized trials do not support breakfast as uniquely necessary for weight control, but the trials were short and generally low quality. Breakfast can still help particular people with hunger, nutrition, medication timing or performance.
Breakfast is not inherently the most important meal for every adult. Eating or skipping it can both fit a healthy pattern, depending on the person and the rest of the day.
The best evidence directly tests weight and daily energy intake, not every possible health outcome. In randomized trials, assigning adults to eat breakfast did not improve weight loss and increased average daily energy intake, but study quality and duration limit certainty.
Safety note: Skipping breakfast is not appropriate for everyone. Children, adolescents, people who are pregnant, people recovering from an eating disorder, and people taking glucose-lowering medicines may need a planned morning meal or individualized guidance.
Talk to a healthcare professional if: Ask for individualized advice if meal timing causes dizziness, low blood sugar, binge eating, poor growth, inadequate intake or medication problems.
Eat breakfast if it supports your hunger, energy, medication schedule or food quality. If you feel well without it, you do not need to force it simply because breakfast is called the most important meal.
Notice how breakfast or skipping it affects your hunger, energy and food choices across the whole day, then choose the routine that works better for you.