Almost all of us have tried a diet at some point in our lives. Sometimes they seem to work, sometimes they really don't - the hard thing is keeping at it.
But keeping at it is just what adult film star Jenna Jameson has managed to do.
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Now, a year on from beginning the keto diet, she has shared two pictures which reveal the dramatic results of her efforts.
In a post on Instagram, the 45-year-old said she had 'absolutely never felt better', adding that sobriety may have played a part too.
The post read: "Today I celebrate 1 year of being #keto I have absolutely never felt better! Combining #sobriety, the keto lifestyle and intermittent fasting is the perfect trifecta for me when it comes to a healthy sustainable fitness journey. Thanks everyone for supporting me and joining me in my quest for ultimate health!!! Love you!"
Jameson claims to have lost around 100lbs on the diet and she has regularly posted updates on her progress on #motivationmondays or #transformationtuesdays.
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In a previous post, she credited the keto diet with helping with her mental health, as well as her weight loss.
She said: "One of the benefits of being physically fit is getting dressed. There never seems to be a struggle anymore! I used to live in spandex, and that depressed me. Wearing denim was out of reach.
"I vividly remember feeling depressed every time I needed to get myself dolled up to go out. Hence, why I was a hermit. I feel so energised and happy now and I LOVE looking cute."
However, while the diet has helped Jameson lose weight and feel better about herself, the transformation process has also taught her to distinguish skinniness and healthiness.
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In another post, she said: "My transition to health has helped me realise a lot of my connection to 'skinniness' was unhealthy. It's very possible to be thin and frightening unhealthy. So thickness does not equate to being sick, but mine was.
"So remember these #beforeandafter pictures aren't just to show the aesthetics of being slim, they show hard work and attention to my inside health. This is a years worth of re-calibration and focus.
"So in closing, remember how important your precious health is... don't stress on what is staring back at you in that mirror."
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For those of you who have never heard of the keto diet, or ketogenic diet, it basically involves eating low-carb foods and is designed to help people burn fat more effectively.
Celebrities such as Gwyneth Paltrow and Halle Berry have also previously endorsed the diet.
Featured Image Credit: PA