But it is true only on condition that one adopts a KETO or low_carb-high_fat diet.
Fat in this case must be the "good" fat as defined within the Keto diet.
There are loads of supporting evidences and articles on the above claim.
Here is one article to support the point.
- FAT IS NOT FATTENING. WEIRD, BUT TRUE
https://www.eatthebutter.org/fat-makes-you-thin
Dr. Andreas Eenfeldt on how Low Carb High Fat works to reduce weight.
http://www.dietdoctor.com/lchf#theory
Clip from Fathead, the movie, entitled 'Why You Got Fat.'
https://www.youtube.com/watch?v=mNYlIcXynwE
Dr. Robert Lustig, a pediatric endocrinologist from UCSF, explains the role hormones insulin and leptin play in weight gain and obesity in this ~8 minute video.
https://www.youtube.com/watch?v=Yo3TRbkIrow
Infographic from Gary Taubes and Massive Health about why fat doesn't make you fat.
http://www.healthvibes.co.za/wp-content ... aphic1.jpg
Infographic from Massive Health: 'What makes you fatter -- bacon and eggs or a bagel with low-fat cream cheese?'
http://thumbnails-visually.netdna-ssl.c ... _w1500.png
Here is a test,
Grass Fed Butter is supposed to be healthy and nutritious.
But how much can one eat from a bar of butter alone?
A bit of butter is tasty but at some point more butter will be a 'put off' or even nauseating.
The point is one's body [normal person] will naturally enable to take in as much butter or fats for the needed daily energy. This is control by Leptin. Thus if one's leptin is in working order then there is no issue of getting OBESE.
But the critical point here is the 'low carb' diet.
The fact is that what makes one fat is due to the conversion of excess carbs to fats by insulin.
Therefore if one is on a low carb diet, there will be no excess carbs and opportunity for the body to store fats in the cell.
The body with leptin will naturally limit the amount of fats one CAN take and the body will convert whatever available carbs and fats to energy sufficient for daily use.
There are other factors that will control the intake and conversion of fats taken into the body.
Of course, I am not saying there is an exact equivalent with what is intake and use; there will be minimal excess and deficit which will not be sufficient to cause obesity nor thin_ness.
So if you are obese [overweight with high BMI] at present and want to reduce weight, try out this strategy;
i.e. reduce your carbs drastically and eat as much fats [good ones] as you CAN or able till a "put off" limit.
Note "CAN" means not force feeding nor deliberately stuffing oneself with as much fats as possible.
Try this for a week and one will see immediate results, of course > two weeks to months will have better results. Note the need for necessary proteins and others vitamins, minerals and supplements, etc.