Denise Mafra, Isabela Brum, Natália A. Borges, Viviane O. Leal, Denis Fouque
The benefits of a low-protein diet (LPD) in patients with altered kidney function remain controversial. Dietary intake studies are inherently complex and may present numerous biases that must be understood and controlled. Due to these challenges, the scientific evidence in this area remains limited and is subject to dispute. However, there is abundant literature showing that excessive protein intake in these patients is linked to cardiovascular issues, oxidative stress, hyperphosphatemia, bone mineral disease, metabolic acidosis, inflammation, and gut dysbiosis, contributing to kidney damage and other concurrent systemic disorders. An LPD remains a valuable recommendation for non-dialysis chronic kidney disease (CKD) patients if age, nutritional status, and disease complications are carefully considered to ensure optimal outcomes. On the one hand, excessive protein intake may lead to the accumulation of nitrogenous waste products, thereby burdening renal function. On the other hand, overly restrictive protein consumption can lead to muscle mass loss, potentially worsening clinical outcomes and patient prognosis. This narrative review highlights the harmful impact of a high-protein diet on kidney function, particularly for those with preexisting kidney impairment or a predisposition to CKD. It also discusses the importance of an individualized and well-monitored protein intake strategy to balance the benefits of protein restriction with the risks of malnutrition.
{"title":"Low-protein diet for chronic kidney disease: Evidence, controversies, and practical guidelines","authors":"Denise Mafra, Isabela Brum, Natália A. Borges, Viviane O. Leal, Denis Fouque","doi":"10.1111/joim.20117","DOIUrl":"10.1111/joim.20117","url":null,"abstract":"<p>The benefits of a low-protein diet (LPD) in patients with altered kidney function remain controversial. Dietary intake studies are inherently complex and may present numerous biases that must be understood and controlled. Due to these challenges, the scientific evidence in this area remains limited and is subject to dispute. However, there is abundant literature showing that excessive protein intake in these patients is linked to cardiovascular issues, oxidative stress, hyperphosphatemia, bone mineral disease, metabolic acidosis, inflammation, and gut dysbiosis, contributing to kidney damage and other concurrent systemic disorders. An LPD remains a valuable recommendation for non-dialysis chronic kidney disease (CKD) patients if age, nutritional status, and disease complications are carefully considered to ensure optimal outcomes. On the one hand, excessive protein intake may lead to the accumulation of nitrogenous waste products, thereby burdening renal function. On the other hand, overly restrictive protein consumption can lead to muscle mass loss, potentially worsening clinical outcomes and patient prognosis. This narrative review highlights the harmful impact of a high-protein diet on kidney function, particularly for those with preexisting kidney impairment or a predisposition to CKD. It also discusses the importance of an individualized and well-monitored protein intake strategy to balance the benefits of protein restriction with the risks of malnutrition.</p>","PeriodicalId":196,"journal":{"name":"Journal of Internal Medicine","volume":"298 4","pages":"319-335"},"PeriodicalIF":9.2,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/joim.20117","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144751948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Heinz Drexel, Laura Schnetzer, Andreas Leiherer, Peter Fraunberger, Arthur Mader, Christoph H. Saely, Andreas Festa
{"title":"Remnant cholesterol as a driver for atherosclerosis in patients with type 2 diabetes: Insights from a long-term prospective cohort study","authors":"Heinz Drexel, Laura Schnetzer, Andreas Leiherer, Peter Fraunberger, Arthur Mader, Christoph H. Saely, Andreas Festa","doi":"10.1111/joim.70001","DOIUrl":"https://doi.org/10.1111/joim.70001","url":null,"abstract":"","PeriodicalId":196,"journal":{"name":"Journal of Internal Medicine","volume":"298 3","pages":"268-272"},"PeriodicalIF":9.2,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144892506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
<p>Dear Editor,</p><p>Antimicrobial resistance (AMR) is the phenomenon that occurs when infections are no longer sensitive to commercially available antimicrobials. Today, it is considered to be among the major global health problems. Among the most important strategies to counter the AMR phenomenon is to find alternative therapeutic strategies to common antimicrobials. Antimicrobial peptides (AMPs) are a class of naturally occurring molecules that act as crucial components of the innate immune system in a wide range of organisms, including humans, animals, plants and microorganisms. These peptides exhibit broad-spectrum antimicrobial properties, enabling them to target and neutralize a variety of pathogens, including bacteria, fungi, viruses and parasites. Recently, AMPs have been increasingly studied as potential therapeutic alternatives to conventional antibiotics. However, there are still many questions to be answered before their established use in clinical practice. The unique structure and different modes of action of AMP make them promising candidates for therapeutic development [<span>1, 2</span>]. The mechanisms of action of AMP are multiple, such as membrane disruption and potential intracellular targeting. Furthermore, through their amphipathic nature and cationic charge, AMPs selectively interact with negatively charged microbial membranes, distinguishing them from host cells. Upon binding, they insert into the lipid bilayer, leading to the formation of pores, thinning of the membrane or its complete disintegration, resulting in ion leakage, loss of membrane potential and eventual cell lysis. In addition to membrane disruption, some AMPs penetrate microbial cells to inhibit vital processes, including DNA/RNA synthesis, protein translation and enzyme activity, such as blocking cell wall biosynthesis. This dual mechanism of membrane attack and intracellular action enhances their broad-spectrum efficacy against bacteria, fungi, viruses and even drug-resistant strains, minimizing the development of resistance. In addition, an immunomodulatory role has been demonstrated for some AMPs, further enhancing host defence. Their versatility makes them promising candidates for the next generation of antimicrobial therapies [<span>3</span>]. Human defensin HBD 2, for instance, is being studied for its potential in the treatment of skin infections, respiratory tract infections and even inflammatory diseases [<span>4</span>]. Cathelicidins are another group of AMPs that demonstrate strong antimicrobial properties. The human cathelicidin, LL-37, is particularly effective against Gram-positive bacteria and has shown potential in the treatment of skin wounds and respiratory infections. LL-37 is also known for its immunomodulatory properties, which help regulate immune responses and promote wound healing. Melittin, derived from bees, is another potent AMP that acts by disrupting bacterial cell membranes. It has shown promise in the treatment of bacteria
{"title":"Therapeutic innovations to counter antimicrobial-resistant infections and antimicrobial peptides","authors":"Antonio Vitiello","doi":"10.1111/joim.70005","DOIUrl":"10.1111/joim.70005","url":null,"abstract":"<p>Dear Editor,</p><p>Antimicrobial resistance (AMR) is the phenomenon that occurs when infections are no longer sensitive to commercially available antimicrobials. Today, it is considered to be among the major global health problems. Among the most important strategies to counter the AMR phenomenon is to find alternative therapeutic strategies to common antimicrobials. Antimicrobial peptides (AMPs) are a class of naturally occurring molecules that act as crucial components of the innate immune system in a wide range of organisms, including humans, animals, plants and microorganisms. These peptides exhibit broad-spectrum antimicrobial properties, enabling them to target and neutralize a variety of pathogens, including bacteria, fungi, viruses and parasites. Recently, AMPs have been increasingly studied as potential therapeutic alternatives to conventional antibiotics. However, there are still many questions to be answered before their established use in clinical practice. The unique structure and different modes of action of AMP make them promising candidates for therapeutic development [<span>1, 2</span>]. The mechanisms of action of AMP are multiple, such as membrane disruption and potential intracellular targeting. Furthermore, through their amphipathic nature and cationic charge, AMPs selectively interact with negatively charged microbial membranes, distinguishing them from host cells. Upon binding, they insert into the lipid bilayer, leading to the formation of pores, thinning of the membrane or its complete disintegration, resulting in ion leakage, loss of membrane potential and eventual cell lysis. In addition to membrane disruption, some AMPs penetrate microbial cells to inhibit vital processes, including DNA/RNA synthesis, protein translation and enzyme activity, such as blocking cell wall biosynthesis. This dual mechanism of membrane attack and intracellular action enhances their broad-spectrum efficacy against bacteria, fungi, viruses and even drug-resistant strains, minimizing the development of resistance. In addition, an immunomodulatory role has been demonstrated for some AMPs, further enhancing host defence. Their versatility makes them promising candidates for the next generation of antimicrobial therapies [<span>3</span>]. Human defensin HBD 2, for instance, is being studied for its potential in the treatment of skin infections, respiratory tract infections and even inflammatory diseases [<span>4</span>]. Cathelicidins are another group of AMPs that demonstrate strong antimicrobial properties. The human cathelicidin, LL-37, is particularly effective against Gram-positive bacteria and has shown potential in the treatment of skin wounds and respiratory infections. LL-37 is also known for its immunomodulatory properties, which help regulate immune responses and promote wound healing. Melittin, derived from bees, is another potent AMP that acts by disrupting bacterial cell membranes. It has shown promise in the treatment of bacteria","PeriodicalId":196,"journal":{"name":"Journal of Internal Medicine","volume":"298 4","pages":"361-362"},"PeriodicalIF":9.2,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/joim.70005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144740752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Antonio García-Ríos, Juan Luis Romero-Cabrera, Juan Francisco Alcalá-Díaz, Gracia M. Quintana-Navarro, Laura Martín-Piedra, Antonio Pablo Arenas-de Larriva, Jose David Torres-Peña, Fernando Rodriguez-Cantalejo, Stefanos N. Kales, José M. Ordovás, Pablo Pérez-Martínez, Javier Delgado-Lista, José López-Miranda