‘Biohack your looks’ longevity expert shares cold water hack and diet tip to get youthfulness back

Aging may not be as inevitable as people think, with one expert leading the trend on looking younger while living longer

Longevity expert Leslie Kenny is lifting the lid on her top “biohacking” routines to help people get through 2025 looking younger than they did in 2024. Biohacking has been a rising trend in the wellness industry over the last few years as people put scientific and medical discoveries to work.

The technique focuses on what we can add to our diets and routine to force a reaction from our bodies in our favour. This usually involves results like losing weight, managing hormones and looking younger while living longer.

The latter is Leslie’s speciality, with her first tip focusing on bathroom routines and “blasting your hair” with cold water. She advised: “The trick is to get it as hot as possible and then try using cold water on top of just your head.

“You’re going to smooth out roughness along the shaft of your hair, which will add shine to your locks. In addition, the forehead and décolletage (neckline) have more receptors for cold so in theory, getting cold onto those areas should give you more of a boost than hitting other areas."

With your hair taken care of, the expert turned to skin longevity next, recommending a range of diet changes rather than skincare products. Starting off, she urged people to specifically add more bone broth, with a squeeze of lemon, to their diets.

She explained: “Bone broth and fish are both great food sources of collagen. Take them together with a squeeze of lemon for vitamin C. Collagen alone is a key building block for your skin and keeps it looking young, but when you take it together with vitamin C, it gives better support and structure to our skin throughout the whole body.

“Collagen can also give your skin that much sought-after youthful glow to look younger, and one study of freshwater marine collagen showed that supplementing with it even reduces wrinkles!” Next up, Leslie noted the millennial breakfast trend of avocado toast could actually be doing more good to their health than they realise.

Praising the high glutathione content in avocados, as well as broccoli and leafy greens, the expert shared: “It's all about glutathione, the body’s master antioxidant made in the liver which not only helps with detoxifying our bodies when we drink alcohol, smoke or are exposed to pollutants but also evens out skin tone and pigmentation. It can soften the look of dark age spots we get when we age.”

Finally, if you’re looking for an overall diet plan to follow for younger looks and healthy cells, Leslie highly recommended the Japanese diet: “This includes foods such as natto and tempeh (fermented soybeans) and shiitake mushrooms, but we can also find them in things like hard, fermented cheese.

She explained why this diet works: “Polyamines, such as spermidine and spermine, are a special combination of amino acids, that can induce autophagy – our body’s natural cellular renewal process which declines dramatically as we age. Which is why these polaymines are so important in helping us look younger. They can also increase the synthesis of collagen and elastin in the skin.”