NHS Surgeon Clarifies: Are Protein and Creatine Shakes Risky for Kidneys?

Protein shakes and creatine supplements have become staples in the fitness world, utilized by everyone from novices to seasoned athletes for strength building, performance enhancement, and muscle support. Yet, warnings about potential kidney damage, stress, and even failure circulate widely on social media, leaving many unsure if these daily boosts come with health risks.

Dr. Karan Rajan, a surgeon associated with the UK's National Health Service (NHS), recently shed light on what occurs when kidneys manage protein and creatine intake. In a video released on November 18, he emphasized that the primary concern lies with individuals who may have underlying kidney issues.

Dr. Rajan stated that people with healthy kidneys need not fret over protein shakes. He pointed out that studies indicate even high protein consumption—up to three grams per kilogram of body weight—does not harm healthy kidneys, which can efficiently filter waste from protein metabolism. For the majority of healthy users, protein shakes remain a safe addition to a well-rounded diet when consumed in moderation.

Conversely, Dr. Rajan highlighted a different scenario for those with chronic kidney disease. Increased protein intake in these individuals can exacerbate their condition over time, as their bodies may struggle to process added waste, placing additional pressure on the kidneys. Consequently, healthcare professionals typically advise reducing protein consumption, which can help mitigate kidney damage and the likelihood of requiring dialysis in the future.

Turning to creatine, another widely-used supplement aimed at boosting energy and enhancing muscle performance, Dr. Rajan confirmed that it also poses no threat to healthy kidneys, with minimal evidence linking it to kidney toxicity in those without medical conditions. However, as with protein, creatine is not advisable for individuals with pre-existing kidney issues due to limited long-term research on its effects.

Dr. Rajan also noted that creatine supplementation could lead to misleading blood test results. Serum creatinine, a common marker for kidney health, can be elevated due to creatine intake, potentially creating a false impression of renal impairment. To avoid this, he recommends using cystatin C as a more accurate diagnostic marker for kidney function among supplement users.

His core message is straightforward: supplements themselves aren't harmful, but responsible usage is key. Healthy individuals can use protein and creatine without fear, while those with existing health conditions should approach them with caution.

As fitness supplements continue trending, particularly among younger demographics eager for rapid results, it’s crucial to recognize that no supplement can substitute for balanced nutrition, proper hydration, and regular medical check-ups. Even for healthy bodies, excessive use of supplements may offer no additional benefits and can occasionally lead to digestive issues or unneeded stress.

Dr. Rajan's advice encourages personal health awareness instead of merely following gym trends or social media influences. His insights underscore that supplements are generally safe for most, but individuals with health concerns should consult with medical professionals beforehand. Informed decisions pave the path to good health, steering clear of misconceptions and fears.