IT MAY HAVE POWERFUL HIDDEN HEALTH BENEFIT THAT'S MAY GO WAY

HIDDEN HEALTH BENEFIT THAT'S MAY GO WAY BEYOND WEIGHT LOSS.

THAT'S MAY GO WAY BEYOND WEIGHT LOSS. GADI SCHWARTZ

BEYOND WEIGHT LOSS. GADI SCHWARTZ EXPLAINS.

GADI SCHWARTZ EXPLAINS. >> Reporter: THEY SAY

EXPLAINS. >> Reporter: THEY SAY SOME PEOPLE EAT TO

>> Reporter: THEY SAY SOME PEOPLE EAT TO LIVE AND OTHERS LIVE

SOME PEOPLE EAT TO LIVE AND OTHERS LIVE TO EAT AND A STUDY IS

LIVE AND OTHERS LIVE TO EAT AND A STUDY IS ASKING WHETHER GOING

TO EAT AND A STUDY IS ASKING WHETHER GOING HUNGRY COULD BE THE

ASKING WHETHER GOING HUNGRY COULD BE THE KEY TO A HEALTHYIER AND

HUNGRY COULD BE THE KEY TO A HEALTHYIER AND LONGER LIFE.

KEY TO A HEALTHYIER AND LONGER LIFE. RESEARCHERS ARE TAKING

LONGER LIFE. RESEARCHERS ARE TAKING A DIVE INTO TWO KINDS

RESEARCHERS ARE TAKING A DIVE INTO TWO KINDS OF ENTERFASTING.

A DIVE INTO TWO KINDS OF ENTERFASTING. INSTEAD OF BREAKFAST,

OF ENTERFASTING. INSTEAD OF BREAKFAST, LUNCH AND DINNER, YOU

INSTEAD OF BREAKFAST, LUNCH AND DINNER, YOU AVOID FOOD 16 TO 18

LUNCH AND DINNER, YOU AVOID FOOD 16 TO 18 HOURS OF DAY AND ONLY

AVOID FOOD 16 TO 18 HOURS OF DAY AND ONLY EAT A SIX TO EIGHT

HOURS OF DAY AND ONLY EAT A SIX TO EIGHT HOUR WINDOW.

EAT A SIX TO EIGHT HOUR WINDOW. EAT THREE MEALS TWO

HOUR WINDOW. EAT THREE MEALS TWO DAYS A WEEK AND ON TWO

EAT THREE MEALS TWO DAYS A WEEK AND ON TWO DAYS YOU CUT BACK TO

DAYS A WEEK AND ON TWO DAYS YOU CUT BACK TO 500 CALORIES.

DAYS YOU CUT BACK TO 500 CALORIES. THE STUDY'S AUTHOR HAS

500 CALORIES. THE STUDY'S AUTHOR HAS BEEN FASTING ENTER

THE STUDY'S AUTHOR HAS BEEN FASTING ENTER INTERMITENTANTLY FOR

BEEN FASTING ENTER INTERMITENTANTLY FOR 30 YEARS.

INTERMITENTANTLY FOR 30 YEARS. HE SAYS THAT QUICK

30 YEARS. HE SAYS THAT QUICK FEAST TO FAMINE

HE SAYS THAT QUICK FEAST TO FAMINE SWITCHES FROM BURNING

FEAST TO FAMINE SWITCHES FROM BURNING TO STORING FAT LIKE

SWITCHES FROM BURNING TO STORING FAT LIKE ANCIENT HUMANS DID.

TO STORING FAT LIKE ANCIENT HUMANS DID. >> OUR BODIES AND

ANCIENT HUMANS DID. >> OUR BODIES AND BRAINS EVOLVE TO

>> OUR BODIES AND BRAINS EVOLVE TO FUNCTION WHILE PERHAPS

BRAINS EVOLVE TO FUNCTION WHILE PERHAPS IN A FASTED STATE.

FUNCTION WHILE PERHAPS IN A FASTED STATE. >> Reporter: SOMETIMES

IN A FASTED STATE. >> Reporter: SOMETIMES IT CAN HELP REDUCE

>> Reporter: SOMETIMES IT CAN HELP REDUCE OBESITY, HIGH

IT CAN HELP REDUCE OBESITY, HIGH CHOLESTEROL AND

OBESITY, HIGH CHOLESTEROL AND INCREASING MEMORY,

CHOLESTEROL AND INCREASING MEMORY, COGNITION AND

INCREASING MEMORY, COGNITION AND RESISTANCE TO DISEASE.

COGNITION AND RESISTANCE TO DISEASE. AN EASY SELL ON

RESISTANCE TO DISEASE. AN EASY SELL ON CALIFORNIA'S MUSCLE

AN EASY SELL ON CALIFORNIA'S MUSCLE BEACH.

CALIFORNIA'S MUSCLE BEACH. >> I FEEL BETTER.

BEACH. >> I FEEL BETTER. >> Reporter: BUT

>> I FEEL BETTER. >> Reporter: BUT RESEARCHERS SAY THE

>> Reporter: BUT RESEARCHERS SAY THE FASTING ISN'T FOR

RESEARCHERS SAY THE FASTING ISN'T FOR EVERYONE, SPECIFICALLY

FASTING ISN'T FOR EVERYONE, SPECIFICALLY CHILDREN, THE ELDERLY,

EVERYONE, SPECIFICALLY CHILDREN, THE ELDERLY, PEOPLE WITH EATING

CHILDREN, THE ELDERLY, PEOPLE WITH EATING DISORDERS OR WOMEN

PEOPLE WITH EATING DISORDERS OR WOMEN PREGNANT OR BREAST

DISORDERS OR WOMEN PREGNANT OR BREAST FEEDING AND IF YOU'RE

PREGNANT OR BREAST FEEDING AND IF YOU'RE THINKING ABOUT IT,