2. A Vitamin or Nutrient Deficiency
A vitamin deficiency, such as not getting enough vitamin D or vitamin B12, could cause you to feel severely tired, according to Cleveland Clinic. Dehydration can have the same effect.
You could also feel suddenly exhausted if you’ve recently started a high-protein diet. It’s not the protein itself making you tired, but the lack of carbohydrates. Severely restricting carbs causes your body to enter ketosis, where it breaks down fat for energy, according to Mayo Clinic.
The side effects of ketosis (sometimes called “keto flu”) include fatigue, dizziness, weakness, and “brain fog,” among others.
These side effects are usually temporary. But if ketosis is causing your sudden energy crash, you may want to add more fiber-rich, complex carbohydrates to your diet. Those include fruits, vegetables, and whole grains like oatmeal and brown rice.
Similarly, skipping meals or following a very low-calorie diet could sap your energy. Women should try to avoid taking in fewer than 1,200 calories per day, and men should try to avoid taking in fewer than 1,500 calories per day, according to Harvard Health Publishing.
But keep in mind that those are bare minimums. A calorie-counting app, or the calculator from the U.S. Department of Agriculture (USDA), can provide an estimate of your ideal daily calorie requirements.
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