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Doctor insights on: Does The Body Break Down Fat If You're Not Eating Enough Calories

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How long does it take your body to break down your body fat from anorexic behaviors? Ex. Eating 50% recommended calories, 15% body fat, male, 180 lb

How long does it take your body to break down your body fat from anorexic behaviors? Ex. Eating 50% recommended calories, 15% body fat, male, 180 lb

Planning a diet?: You're actually describing a rigorous weight-loss diet such as athletes undertake to make weight or fitness guys to "get ripped"; it would be an anorexic behavior if it became an obsession or you were likely to hurt yourself. You're at your physical prime and if you can adopt a fitness-focused lifestyle instead of episodic diet, it's be great. Your physician can help. ...Read more

Calorie (Definition)

A calorie is the amount of heat energy needed to increase a mililiter of water 1 degree centigrade, the calorie we talk about in foods is really a kilocalorie, that is the amount of energy needed to increase a liter of water 1 degree centigrade... So if you eat a food that is 500 calories that food if burned completely has enough energy to heat a liter of ...Read more


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What are some symptoms I can use to tell if my body is shutting down from eating too little? I'm eating around 500 calories daily.

What are some symptoms I can use to tell if my body is shutting down from eating too little? I'm eating around 500 calories daily.

Counseling: You need psychologic or psychiatric counseling badly since you may be anorexic. Aside from weight loss, you will have hormone issue, weakness, nutritional deficiency, nerve damages... And even death, just to name a few. Call for an appointment now. ...Read more

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If I get diarrhea after eating does that mean my body is not absorbing the calories or fat and vitamins?

If I get diarrhea after eating does that mean my body is not absorbing the calories or fat and vitamins?

Possibly: It might also mean you are sensitive to a particular food. If you're lactose intollerant, for example, you will getting bloating, gas and diarrhea after eating dairy. It's helpful to keep a food log and write down what you eat and when you have diarrhea. This will help you see what foods trigger the problem. If this has only been going on for a short time, it might be something viral. ...Read more

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When eating 500 calories less than normal diet. Does the body burn fat or muscle first?

When eating 500 calories less than normal diet. Does the body burn fat or muscle first?

Muscle: This can, however, be modified by mainly exercise. It is a bit more in the non-young (yay for you). It is also less in those like me who chronically restrict calories. There is adaption over weeks to increase the proportion of fat burned (yay me). ...Read more

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I cannot consume enough calories can I die from losing too much body fat?

I cannot consume enough calories can I die from losing too much body fat?

See: An endocrinologist for an evaluation of your metabolism no reason a young person should have to eat so many calories ...Read more

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I am 5ft and 97 pounds. I do have a very high body fat percentage like 30 percent last time I checked and I want to lose a few pounds. How many calories should I eat (please don't say 1, 200- that's how I gained a lot of weight) also I splurged yeste

Exercise and caloric: Restriction. To effectively lose weight you need to do more physical exercise and reduce your caloric intake. To lose one pound you need to generate a negative balance of about 4500 calories. So reduce your caloric intake accordingly. It would be useful to consult a dietitian for advise on foods and quantity of foods. ...Read more

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How much body fat can you lose on a 1300 calorie diet exercising six days a week?

How much body fat can you lose on a 1300 calorie diet exercising six days a week?

3500 deficit = 1lb: Find some online calculators to help you calculate your daily energy expenditure with your form of exercise. So, if are burning 1800 calories each day, then you'll have a 500 cal deficit and lose 1pound each week. ...Read more

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Is it true that being on a restricted calorie diet for a few years, the body will have truoble to gain back fat once back on a normal diet?

Starvation Diet: No. Quite the opposite. Eating normally will cause rapid weight gain and fat deposition since the body will not have a good sense of metabolism. ...Read more

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I have read that fat is 9 calories per gram, but does anyone know how many calories are in 1 ounce of "body fat" (including the water, cells, etc.)?

I have read that fat is 9 calories per gram, but does anyone know how many calories are in 1 ounce of "body fat" (including the water, cells, etc.)?

About 256 Kcal: 256 calories in an ounce of fat, fat is fat, including any water weight which is a part of every cell, cells can't function without water. ...Read more

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Reducing ones body fat is a matter of calories in vs calories out?

Reducing ones body fat is a matter of calories in vs calories out?

Not exactly: Newer research suggests it is more complex than that. For instance, two people can eat the same amount of calories, all other things being equal, and show different amounts of wt gain or loss. This suggest people are different and even calories are different. ...Read more

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Is there any nutritional value to burning stored fat in our bodies if we have calorie deficit?

Is there any nutritional value to burning stored fat in our bodies if we have calorie deficit?

9 calories per gram: When you burn stored fat, it yields about 9 calories per gram of fat burned. It is important to not starve but maintain a certain base level intake of protein and carbohydrates as using fats alone will cause acidosis and other metabolic problems. ...Read more

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Will exercising vigorously on a 1000 calorie diet help me shed body fat fast?

Will exercising vigorously on a 1000 calorie diet help me shed body fat fast?

Yes, but: This may be dangerous and you should consider moderating your approach in order to not cause other health problems. ...Read more

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How to figure out how many calories of carbs does your body store before turning them into fat?

How to figure out how many calories of carbs does your body store before turning them into fat?

Age, and gender: Normal body functions require a baseline of energy- approx. 12-1600 cal based on age, ht/wt, gender and genetic predisposition. If you have chronically dieted, consuming less than 1200 cal/day your body will adapt and burn less. The concept of increase energy use- exercise with reduced calories should prove to be a vital combination to lose weight. ...Read more

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I am a 25 year old 175 lb man who exercises 3-4 times a wk What's the minimum calories I can hav without havin my body go into starve mode & store fat?

I am a 25 year old 175 lb man who exercises 3-4 times a wk What's the minimum calories I can hav without havin my body go into starve mode & store fat?

Sorry, but...: I can't answer that question because the assumption you make that "going into starvation mode" makes you "store fat" is incorrect. (Maybe I misunderstood what you were asking.) A very low calorie diet may slow down your metabolism as a protective mechanism against starvation but, if you're burning off more calories than you take in, you will lose weight (including fat). ...Read more

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How many calories need to be burnt to get rid of 1 kg of human body fat?

How many calories need to be burnt to get rid of 1 kg of human body fat?

Fat caloric value: A pound (454gm) of fat represents about 3500 calories (@ 9 kcal/gm). A kg is about 2.2 pounds, so that's 7700. Eating 175 fewer calories a day would mean losing a pound every 20 days. Or if you burned an extra 175 calories a day by exercising more, then you could lose a pound in about 20 days. The combination of both would accelerate and double that weight loss. ...Read more

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I need about 2800 calories per day, now I'm dieting to cut down, if I cut hard will I lose more fat or more muscle?

I need about 2800 calories per day, now I'm dieting to cut down, if I cut hard will I lose more fat or more muscle?

More muscle: Unless precautions are taken. Weight lifting will change the proportion to more fat lost than muscle. Also, being male, younger will tend to help. ...Read more

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What's the best way to decrease body fat I run a lot and do not consume very many calories or carbs just not working any tips?

Weight loss: Stick to a plant based diet, do aerobic exercise 4 to 6 times a week in your target zone, being a little breathy and do weight training three times a week. You should see results in time with this regimen. Best. ...Read more

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What is the lowest number of calories a mostly sedentary 5'5, 150lbs, 20 year old woman can eat without complications to lose body fat?

What is the lowest number of calories a mostly sedentary 5'5, 150lbs, 20 year old woman can eat without complications to lose body fat?

This would be: Somewhat debatable, but I am not comfortable with my patients consuming fewer than 1000 calories per day. That can be a safe level is it is balanced with protein, complex carbohydrates and healthy fats. Less than this and you risk malnutrition, lowering of metabolic rate and other serious complications. Even at 1000 cal/day you should get professional (doctor/dietitian) advice for safety. Good luck ...Read more

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You slim down your thighs the same way you slim down every part of your body, by burning more calories than you take in. Is this statement true?

You slim down your thighs the same way you slim down every part of your body, by burning more calories than you take in. Is this statement true?

Largely true. ..: In addition to taking in fewer calories and burning more, you may be able to slim or tone your thighs by doing some lower extremity weight training. This may result in developing the muscle in place of fat which which results in a slimmer profile. Make sure you don't under eat....lower ing your metabolic rate from taking in too few calories can sabotage your efforts. Good wishes:) ...Read more

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For fat loss I lower my calories do exercise n lost 20 pounds but see nothing difference in my body n I eat also less protein plz tell me what u think?

For fat loss I lower my calories do exercise n lost 20 pounds but see nothing difference in my body n I eat also less protein plz tell me what u think?

Weight loss: 1st congratulations on 20 pound weight loss. But I am curious that you can't see/feel any difference. Certainly your clothes should feel looser, at least at waist. I would also expect you to report increase energy since you're lugging around less weight. Eating less & exercising more are basic tenets to weight loss but we usually recommend eating enough protein, not less. Chat w/your FamilyDoc ...Read more

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If I am in ketosis dose that mean I can burn body fat without reaching calorie deficit? If not then what is the point of being in ketosis?

If I am in ketosis dose that mean I can burn body fat without reaching calorie deficit? If not then what is the point of being in ketosis?

Ketosis: Some people will try to enter ketosis (through specialized diets or lengthy exercise) intentionally to better target "fat burning". Whether this is healthy and/or leads to sustained weight loss is controversial. But a calorie is a calorie, regardless of its storage or form. So you need a calorie deficit to lose weight. But it's not essential to be in ketosis to do this. ...Read more

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Is there a sign my body will give me to let me know I am burning fat/calories after a workout coupled with a healthy diet, besides appearing slimmer?

Is there a sign my body will give me to let me know I am burning fat/calories after a workout coupled with a healthy diet, besides appearing slimmer?

No magic signs: No magic signs, other than "keep up the good work." If you eat a healthy diet and burn more calories through exercise than what you take in, you will lose weight. Weigh yourself periodically and you can track your progress. Remember, "slow and steady" wins the race, ...you do not have to lose many pounds all at once. Best wishes. ...Read more

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If the body burns carbs first then dose that mean even if I reach calorie deficit I still won't be burning be burning fat?

If the body burns carbs first then dose that mean even if I reach calorie deficit I still won't be burning be burning fat?

It's more complex...: The human body likes to use glucose (a sugar, thus a carb), which comes from the food in the stomach & small intestine, and from the liver (where glucose is stored in a starch form called glycogen). As long as one is not eating enough to supply glucose to his cells, his liver will run low on glucose/glycogen, and his body will burn other fuels like fat (and even protein) to keep his cells working. ...Read more

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I was wondering what does my diet (calorie intake) have to look like if I want to gain muscle and lose my body fat?

Change proprtions: To lose weight/fat we need to eat fewer carbohydrate and lipid calories getting fewer each day than we burn. To gain muscle mass and not weight we need to add protein and exercise the specific muscle groups we want to bulk up. ...Read more

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Will running two miles per day on a standard 1800 calorie diet help me burn body fat and gain muscle?

Will running two miles per day on a standard 1800 calorie diet help me burn body fat and gain muscle?

Yes and no: In men and women, resistance training combined with a healthy diet will build muscles....More in men than women but it works for both. Stronger muscles tend to burn more calories than weaker muscles even when you are not using them...That helps reduce fat. Lifting with proper form to the point of momentary failure plus a good diet seems to be the best way to get the muscles to respond. ...Read more

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What's the calorie intake/needs for a 60 yr old man 6'0" who weighs 238lb who is trying to gain muscle, lose fat, and drop total body weight?

Weight loss: There is a great app that can figure that our for you. You can access it through a smart phone or you can go online. Www. Myfitnesspal. Com. ...Read more

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I started weightlifting. Many people I've met recommend the paleo diet. If half of my calories came from saturated fat, what would it do to my body?

I started weightlifting. Many people I've met recommend the paleo diet. If half of my calories came from saturated fat, what would it do to my body?

Unknown: It was widely believed that the low carb, high fat, atkins diet would cause a marked increase in LDL cholesterol and heart disease but it didn't. If you're normal weight and exercising regularly, it may not matter what you're eating but this has not been conclusively proven. As a cardiologist, I do not recommend 50% of calories from sat. Fat but you can measure your own lipids & see for yourself. ...Read more

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What happens to your body if you are consantly dieting on a low calorie and low carb diet, can you gain body fat easier in the long run?

What happens to your body if you are consantly dieting on a low calorie and low carb diet, can you gain body fat easier in the long run?

Probably, slowly: Depending upon how restrictive is your diet, and how much fat you have lost, you can certainly expect some gain when resuming a more balanced diet. How soon you gain lost fat, would depend on different factors like your absorption or other GI health issues. ...Read more