The Dark Side of Fasting (and Intermittent Fasting): Dr. Berg Explains | DrEricBergDC

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there are so many benefits to doing

intermittent fasting but there’s also

the dark side which I want to talk about

too the benefits are weight loss

cognitive improvements Focus attention

memory or heart issue or whatever you’re

going to find those will probably be a

lot better but here’s a thing you need

to know about intermittent fasting okay

your avoiding food for a period of time

and most of the things I’m going to talk

about are not related necessarily to a

16 or 17 or 18 hour fast I’m talking

about when you do prolonged fasting

let’s say you’re doing it for 48 hours

72 or even longer this information

applies more to that situation all right

so here’s the thing the purpose of food

is to not just get fuel for your body

is to get nutrients from the food so if

you are not eating because you’re

fasting okay you’re restricting

nutrients and if your diet is not

providing all the nutrients okay you can

end up with not just deficiencies but

what’s called subclinical nutrition

deficiencies and that can set you up for

a lot of problems so virtually all the

things I’m going to talk about are

related to that one point so let’s first

talk about the first one it’s called

refeeding syndrome so let’s say you do

this uh I don’t know three or four or

five day fast okay and then you eat this

huge meal not a good idea especially if

you eat a carbohydrate meal and you have

some type of pre-existing nutritional

deficiency because this could be

dangerous and you can have a lot of

problems it’s always good and safe when

you come off a fast to just have a

little bit of food wait for a couple

hours eat a little bit more and I

wouldn’t do carbohydrates I would do a

little protein maybe an egg or a little

bit salad wait a little bit maybe have

some nuts an avocado things like that

but don’t do what I did I mean I was

just like because I didn’t eat for a

long period of time I over compensated I

just ate a ton of food and I felt really

good for about a minute and then I’m

like oh my gosh I don’t feel too good I

feel really sick my body from not eating

just wasn’t used to that much food so

break your fast with a smaller meal and

gradually come out of it I will put a

link down below for more details on that

thing but this refeeding syndrome

problem usually occurs if you know maybe

you have a problem with anorexia or

you’re a chronic alcoholic or you have

some type of malabsorption issue where

you don’t get enough nutrition because

you have inflammatory issues in your gut

or your elderly or you have advanced

diabetes or even you’re on certain

medications like antacids or diuretics

that deplete you of certain nutrients or

you just basically have a low vitamin B1

deficiency so that’s when you start

having problems with the refeeding

syndrome because we have this shift of

fluid and electrolytes from inside the

cell

to the blood all right so that’s number

one number two dirty keto which is

basically you’re doing low carb but

you’re not looking at the quality of the

food you’re not looking at nutrients and

like I said before it’s always this

nutritional deficiency problem because

when you eat junk food even if it’s low

carb junk food the quality is not there

the nutrition is not there it can set

you up for more problems because you’re

not eating and you’re restricting these

nutrients even more like for example

zinc your body has enough stored zinc to

last like four days well let’s say you

don’t get enough zinc from the diet

which a lot of people don’t and then

here you are going into this fastest

situation and then you just magnified

that deficiency in a zinc deficiency can

show up as a weakness within your immune

system it can affect your taste it can

affect your vision it can affect your

skin it can affect your stomach like

gastritis things like that all right

number three not taking nutrients while

you’re fasting I always recommend taking

at at least at a bare minimum

electrolytes trace minerals and B

vitamins but the point is if you don’t

take these electrolytes and I’m also

talking about sea salt and you’re

fasting especially two three or four or

five days you might have issues like

feeling faint dizzy heard about people

just passed out and also when you’re

either on the ketogenic diet or you do

intermittent fasting you’re running on

ketones running on ketones increases the

demand for certain nutrients like

vitamin B1 and other B vitamins and even

potassium which means you can also end

up with something like keto fatigue or a

keto rash or just weakness in general

all right number four kidney stones

kidney stones can occur for several

reasons the most common one is uric acid

stones and let’s say for example you’re

doing in the ketogenic diet you’re doing

intermittent fasting typically people

eat a lot of almonds right and they

might do some non-sugar chocolate or

they also might do spinach all three of

those are very high in oxalates and if

you’re predisposed to kidney stones

that could make it worse I would

definitely avoid those Foods if you have

a tendency to get kidney stones and I

would also take lemon juice in your

water

and drink enough water like two and a

half liters of fluid a day and that

alone should prevent kidney stones now

the other type of kidney stones is uric

acid Stones it is true when you do long

fast your uric acid goes up okay and

then it comes down and stabilizes

that’s not a pathogenic problem because

uric acid is probably one of the most

potent antioxidants in your blood and so

it doesn’t mean that you’re going to

have gout or some type of arthritis no

it just means when you do a fast you may

have certain chemistry changes occurring

and one really good thing for uric acid

just to kind of counter it when you

eventually eat make sure you have big

salads which I always recommend

to kind of flesh out any type of uric

acid that might be concentrating now

this may become a problem if with a

person doing

uh carnivore but I have not really seen

that being a problem somehow the body

compensates and they don’t seem to have

more problems with gout they have less

problems with gout even though they’re

doing a lot of animal protein which is

interesting number five if you’re

anorexic you’re going to have

nutritional deficiencies so when you do

intermittent fasting it’s going to

create more of a problem so I don’t

recommend intermittent fasting if you’re

bulimic or anorexic but I do recommend

the ketogenic diet for sure but not

prolong fasting number six athletes that

have not adapted to Fat yet okay so in

this process of getting on keto you

start adapting to keto which within like

three days but then it actually takes

one to three months to fully adapt to

your fat metabolism right so to be fat

adapted it takes a lot longer than what

you might think so in the process and

you’re working out you may not have

adapted to Fat so when you exercise you

might kind of have energy and then kind

of come down but I will say over time

there are athletes that have adapted to

this fat

over a period of months and man they can

burn fat three times better than anyone

else they can just go go so the point is

that you have to give it more time and

in the process of this adaptation you

might want to adjust your workouts and

training maybe right after you eat until

you can fully fat adapt just as a side

note too if you’re an athlete and you’re

exercising and you don’t have enough a

sea salt your muscles will be weak okay

also potassium is very very important as

well number seven if you’re a child okay

not the best idea to do any type of

prolonged fasting now let’s say you’re a

teenager overweight like let’s say

you’re obese well maybe you would just

do like two meals but I would definitely

start cutting out the snacking I don’t

agree with this snacking all day long

but the point is if you have three solid

meals with a child and they’re nutrient

dense I mean that’s what you want to do

why because what we’re trying to do is

prevent and nutritional deficiencies and

it is more difficult to get nutrients

from food nowadays I mean even go in the

grocery store most of the lettuces that

you eat are Hydroponic and I do have a

problem with that because they only put

15 minerals in there and they’re kind of

bland they tasteless I really don’t

think they have the same nutrients as

salad that’s grown on soil all right

number eight nutrition is most important

when you’re pregnant and when you’re

lactating because you’re eating for two

and you’re providing milk and your body

is becoming depleted just a deficiency

of vitamin D can set your child up for

all sorts of dental malformations which

then cause the need for braces down the

road or they might have an overbite or

an underbite or they might have flat

feet or bowed legs all of these things

can be easily solved if that mother has

enough of the right nutrients also

realize that most the prenatals out

there are all synthetic get a whole food

natural prenatal especially take it when

you’re breastfeeding as well and one

more point about infant formulas and

baby food unfortunately

it’s like Ultra processed food if you

look at the ingredients

it doesn’t even resemble real food

unfortunately so there are some

Alternatives I will put a link down

below of what I recommend for

um for children like baby food that’s

actually much better number nine if you

have a loss of muscle let’s say for

example you’re older and you’re starting

to develop muscle loss and you’re doing

intermittent fasting

I recommend adding one additional

nutrient a blend of amino acids that can

actually give you this raw material

without creating a problem of it turning

into sugar but it can actually Supply

the muscles to prevent a loss of muscle

and if you’re taking the other nutrients

like the B vitamins and electrolytes you

allow these amino acids to be formed as

muscle because all the biochemistry all

the requirements for the enzymes mostly

they’re just protein and this goes

beyond the Protein that’s needed for

muscle ligament tendon fascia connective

tissue all of those protein molecules

need cofactors and coenzymes and those

are the vitamins and minerals so we come

full circle to these nutrients right so

I’m trying to really emphasize that one

point and then number 10

ketoacidosis if you look up the dangers

of fasting if you look up the the

dangers of Keto you will see this word

keeps coming up this is a situation

where you have too much ketones going in

your body and too many ketones are

producing an acidity in your blood which

can be very very dangerous okay but

there’s so much confusion I want to just

clarify this right now you have

physiological ketosis okay and you also

have

ketoacidosis they’re not the same at all

the point is that ketoacidosis is very

rare unless you have the following

conditions uncontrolled diabetes where

you have type 1 diabetes sometimes type

2 you’re taking insulin and you forgot

to take your insulin in type 1 you have

the cells of the pancreas that have just

basically stopped producing insulin okay

so what’s going to happen to your blood

sugars they’re going to go very very

high because you have no insulin to

monitor that or or regulate that but

insulin also controls ketones and so

insulin suppresses ketones and if you

have no more insulin you have this

massive flush or generation of ketones

so your body starts burning fat like

crazy and you have very high levels

above 10 or 11 or 12 levels of ketones

now typically when you do the

physiological ketones which you’re this

is a natural process you restrict

carbohydrates and usually you’re going

to go between 0.5 to 3. I haven’t seen

many people go over five or even six and

to do that you have to do prolonged

fasting and exercise but the great

majority of people are going to be three

I mean this is a very far range from 10

okay so uncontrolled diabetes

if you’re a chronic alcoholic okay you

could have the same problem if you’re on

certain medications like high levels of

aspirin can create this situation even

certain drugs like cocaine for example

you can go into this ketoacidosis when

you abuse cocaine or there’s other

conditions like chronic liver disease

right where the liver is very very

damaged and on top of that you’re a

diabetic that can create a problem as

well or even if you’re um pregnant

malnutrition so as you can see there are

conditions that can make you more

vulnerable to this ketoacidosis but it’s

very very rare the physiologic ketosis

okay is not pathogenic it’s extremely

healthy and there’s huge benefits if

anyone says that ketosis is is toxic

just ask them about what about

glucotoxicity right that’s high carb

that’s high sugar what is that that’s

like all the bad effects from diabetes

because you’re massively high sugar what

about the dangers of that and also think

about this one last Point keep acidosis

usually originates because you’re eating

too many carbs you’re not doing low carb

you’re eating high carbs destroys the

pancreas and then you get ketoacidosis

so anyway I just wanted to cover these

points the next point is if you now want

to know how to do intermittent fasting

correctly you should watch this video

right here