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Q.

What is the minimum number of calories a woman can safely eat long term (up to two years or more)?

I’ve seen numbers ranging from 800 to 1200 (even here on WebMD), where 800 might be the break between low calorie and very low calorie, and 1050 is where your body enters starvation mode.

1200 is the conventional number but is this in keeping with modern understanding? If a person opted for 800 without supervision, would this be safe and sustainable long-term, provided it was followed with proper transition and maintenance?

Related Topics: Calorie
 

Answers From Experts & Organizations (1)

Fitness
Health Coach, WebMD
96 Answers
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A.

The actual minimal number of calories that you can safely eat long term depends on your basal metabolic rate (BMR), which is the energy necessary for your body and its organs to maintain normal function while simply at rest. Although there are equations to calculate BMR, such as the Harris-Benedict equation, these are all theoretical estimations and your actual number could vary. There are other, more accurate methods to calculate your BMR through either direct or indirect calorimetry techniques that usually measure gas exchange between oxygen consumption and CO2 production. You could do an internet search to find test facilities near you for these methods if you’re genuinely curious, otherwise the BMR equations might give you a good enough estimate.

You’re correct in stating that 1,200 calories is typically the conventional lower threshold value given and I think that it’s fair to use as an estimate for most of the general population (again, your actual number will vary). By far, however, 800 calories per day would be considered a very low calorie diet (VLCD) because it would be very hard to meet your nutritional needs with so few calories. This type of diet would generally not be recommended for individuals who are not obese and who don’t have proper medical supervision. Your doctor will take your specific circumstances into consideration before helping you decide if you should go on a VLCD and you may need to work with a dietitian to develop a specific eating plan to help ensure that you meet your nutrient needs while following the diet.

It’s important to note that although VLCDs have been shown to lower weight and help with obesity-related conditions like hypertension, diabetes, or high cholesterol in obese individuals; they don’t seem to be any more effective than a more modest dietary eating plan long term. You will likely regain any weight loss after going off the VLCD unless you transition into a healthy eating plan while incorporating regular exercise, which is another aspect of why medical supervision from your doctor or a dietitian would be essential.

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