Mom, and commercials, have been telling us to start our day the healthy way with breakfast, but one nutritionist says breakfast isn't all that it is cracked up to be.

Dr. James Betts said that the thought the only way of getting a morning kick start with a hearty meal may have came from marketing campaigns created to make people buy cereal, eggs and bacon, The Telegraph reported.

"The problem is that these benefits, although logical-sounding, are largely assumptions based on observational studies and had never actually been tested," Betts said.

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To put the claims to the test, Betts had one group eat a 700-calorie meal. Another group drank only water until lunch, The Guardian reported.

Those who drank the water only did eat a larger lunch, but not enough to make up for the 700 calories they missed for breakfast.

It also did not affect fat levels or make people gain weight.

Those who ate breakfast did burn off the extra calories through minor physical activity.

The study did not look at how it affects our mood or cognitive awareness. It also didn't look at the effects of caffeine from tea or coffee.

The study appears in this month's American Journal of Clinical Nutrition.