Harriët Jager-Wittenaar

• Professor
• Professor at Radboud university medical center (Radboudumc)

Background Malnutrition and sarcopenia impact the physical health and quality of life of community-dwelling older adults. Managing these conditions requires integrating nutritional and exercise interventions delivered by professionals from diverse backgrounds. Interprofessional collaboration holds promise for providing integrated, person-centered c...

Background The cause of lipoedema remains unclear, and the condition is currently incurable. Effective self-management is therefore essential for coping with its physical and psychological impacts and the necessary lifestyle adjustments. This study aimed to assess the needs, barriers, and facilitators for enhancing self-management and self-manageme...

Purpose The aim of this study was to explore the functioning of people with lipoedema from their perspective. Methods This was a qualitative study following a phenomenological perspective using individual in-depth interviews with a convenience sample of 13 Dutch people with lipoedema. The data were analysed by using an interpretative phenomenologi...

Background Multimodal prehabilitation programs are effective at reducing complications after colorectal surgery in patients with a high risk of postoperative complications due to low aerobic capacity and/or malnutrition. However, high implementation fidelity is needed to achieve these effects in real-life practice. This study aimed to investigate t...

Purpose: To describe perceptions and experiences of people who have undergone a major dysvascular lower limb amputation (LLA) regarding nutrition, and to identify perceived barriers and facilitators regarding nutritional intake. Methods: In this phenomenological qualitative study, individual, semi-structured, face-to-face, interviews were conduc...

Background Dietetic treatment of adults with obesity can result in effective weight loss with health improvements. However, it remains unclear which components of dietetic consultation are key for successful treatment of individual patients. Therefore, the aim of this study is to explore dietitians' perceptions of key components relevant for succes...

Background Preventing metabolic syndrome (MetS) and frailty in older adults is crucial for healthy aging. The association between MetS and physical frailty is well-documented, with low-grade inflammation as potential explanation. However, the association between MetS and frailty as a multidimensional concept, and the association of low-grade inflam...

Background Physical and social distancing measures during the COVID-19 pandemic had the potential to jeopardize health and well-being of older adults. Especially older adults who lived alone faced challenges due to restrictive COVID-19 measures. In this study, we explored views and support needs to maintain health and well-being of older adults liv...

Inaugural speech 'Dietetics and nutritional care in transition'

Background Frailty is a common condition in older people, and its prevalence increases with age. With an ageing population, the adverse consequences of frailty cause an increasing appeal to the health care system. The impact of frailty on population level is often assessed using adverse health outcomes, such as mortality and medication use. Use of...

Background As our global population ages, malnutrition and sarcopenia are increasingly prevalent. Given the multifactorial nature of these conditions, effective management of (risk of) malnutrition and sarcopenia necessitates interprofessional collaboration (IPC). This study aimed to understand primary and social care professionals’ barriers, facil...

Frailty is a common but complex phenomenon that is approached from theoretical and professional perspectives but rarely from the perspectives of older people and their essential stakeholders. Different or opposing perspectives on frailty at personal, organisational, and community levels can negatively affect care for frail older people. This system...

Purpose The Scored Patient-Generated Subjective Global Assessment (PG-SGA©) is a validated nutritional screening, assessment, triage, and monitoring tool. The aim of this study was to perform translation, cultural adaptation, linguistic, and content validation of the translated and culturally adapted version of the PG-SGA for the Polish setting. M...

Background the global population is ageing. As older people become more susceptible to frailty, an increase in frailty prevalence is also expected. Although frailty has been defined before in research, older peoples’ perceptions of frailty do not always coincide with those used in research or medical settings. Further exploring community-dwelling o...

The COVID-19 pandemic affected the lives of older adults. Yet, little is known about changes in well-being among older adults during the pandemic, especially when COVID-19 measures were relaxed. Therefore, we aimed to assess changes in the well-being of older adults during multiple turning points of the pandemic. This longitudinal study included da...

Background Multimodal prehabilitation programs are effective in reducing complications after colorectal surgery in patients with a high risk of postoperative complications due to low aerobic capacity and/or malnutrition. However, high implementation fidelity is needed to achieve these effects in real-life practice. This study aimed to investigate t...

Purpose of review With the shifts in society, healthcare and the profile of the malnourished individual, a re-consideration of the goal of nutritional risk screening is needed: screening for malnutrition, or screening for risk of malnutrition? In this review article, we reflect on the role of nutritional risk screening in relation to prevention and...

Introduction The scored Patient‐Generated Subjective Global Assessment (PG‐SGA©) is a validated tool for the screening, assessment and monitoring of malnutrition, and triaging of interventions. It contains a patient‐generated component and a healthcare professional (HCP)‐generated component. Aim To translate the PG‐SGA into Swedish, assess the lin...

Purpose: The Scored Patient-Generated Subjective Global Assessment (PG-SGA©) is a validated nutritional screening, assessment, monitoring, and triage tool. The aim of this study was to perform translation, cultural adaptation, as well as linguistic and content validation of the translated and culturally adapted version of the PG-SGA for the Polish...

Echo intensity determined by muscle ultrasound has been proposed as an efficient method for the assessment of muscle quality. The influence of changing ultrasound parameter settings on echo intensity values was assessed using a standardized approach. In this repeated measures cross-sectional study, sixteen repeated scans of rectus femoris, gracilis...

Background: According to EWGSOP2, the diagnosis of sarcopenia is confirmed when in addition to low muscle strength, low muscle quantity or quality is present. Echo intensity (EI) determined by muscle ultrasound (US) has been proposed as an efficient method for the assessment of muscle quality. The effect of changing various US parameter settings on...

Background The Global Leadership Initiative on Malnutrition (GLIM) approach to malnutrition diagnosis is based on assessment of three phenotypic (weight loss, low body mass index, and reduced skeletal muscle mass) and two etiologic (reduced food intake/assimilation and disease burden/inflammation) criteria, with diagnosis confirmed by fulfillment o...

In this article, we show how elderly clients in Dutch dietary consultations adjust dietitians’ history taking questions that suggest a cause for weight loss. Using conversation analysis and discursive psychology, we analyzed the history taking phase of recorded primary care conversations of 7 dietitians with 17 clients with malnutrition (risk). In...

Background COVID-19 measures affected the lives of many older adults. Yet, little is known on changes in health among older adults, especially in periods when COVID-19 measures relaxed. We aimed to assess changes in health of older adults during multiple turning points of the COVID-19 pandemic and to analyse differences in changes in health between...

Background: The positive association between obesity based on body mass index (BMI) and periodontitis has been reported. Fat tissue-related systemic inflammation acts as the link to periodontal comorbidities of obesity. However, the BMI is unable to distinguish fat and fat-free tissues. More precise measures are required to evaluate body compositio...

In 2010, the definition of cachexia was jointly developed by the European Society for Clinical Nutrition and Metabolism (ESPEN) Special Interest Groups (SIG) "Cachexia-anorexia in chronic wasting diseases" and "Nutrition in geriatrics". Cachexia was considered as a synonym of disease-related malnutrition (DRM) with inflammation by the ESPEN guideli...

Background Frailty in older adults is an increasing challenge for individuals, health care organizations and public health, both globally and in The Netherlands. To focus on frailty prevention from a public health perspective, understanding of frailty status is needed. To enable measurement of frailty within a health survey that currently does not...

Unlabelled: The Patient-Generated Subjective Global Assessment (PG-SGA) is an instrument to screen, assess and monitor malnutrition and risk factors, and to triage for interventions. After having translated and culturally adapted the original PG-SGA for the Italian setting, according to International Society for Pharmacoeconomics and Outcomes Rese...

Introduction In patients with cancer, low muscle mass has been associated with a higher risk of fatigue, poorer treatment outcomes, and mortality. To determine body composition with computed tomography (CT), measuring the muscle quantity at the level of lumbar 3 (L3) is suggested. However, in patients with cancer, CT imaging of the L3 level is not...

Lipoedema is a painful non-pitting diffuse “fatty” swelling, usually confined to the legs, that occurs mainly in women. This scoping review aimed to provide an overview of the available research on the functioning of people with lipoedema, according to the International Classification of Functioning, Disability and Health (ICF) framework. Relevant...

Purpose: To systematically review literature on nutritional intake, nutritional status and nutritional interventions, and to study their association with short- and long-term clinical outcomes in people with a major dysvascular lower limb amputation. Methods: PubMed, Ovid, CINAHL, and The Cochrane Library were searched. Studies were included if...

Purpose Both malnutrition and frailty are associated with adverse treatment outcomes. Malnutrition (risk) and frailty are each commonly present in patients with head and neck cancer (HNC). However, their coexistence and association is unknown. Main goal of this study is to determine the coexistence of, and the association between malnutrition risk...

Introduction The characteristics and impact of mouthfeel, temperature, smell, and taste alterations in patients with COVID-19 at a long term are yet not well known. In this study, these characteristics and their impact on daily life and quality of life (QoL) were assessed, six to ten months after infection, in patients with COVID-19 searching for p...

Background: Frailty is a term widely and increasingly used in describing a condition of individuals experiencing multiple problems in one or more domains of human functioning, physical, psychological, and/or social. Frailty is a common condition among older people. Yet, it seems older people barely use this term. This study aims to answer the foll...

Background Frailty is associated with COVID-19 severity in clinical settings. No general population-based studies on the association between actual frailty status and COVID-19 hospitalization are available. Aims To investigate the association between frailty and the risk of COVID-19 hospitalization once infected. Methods 440 older adults who part...

Background Survival of kidney transplant recipients (KTR) is low compared with the general population. Low muscle mass and muscle strength may contribute to lower survival, but practical measures of muscle status suitable for routine care have not been evaluated for their association with long‐term survival and their relation with each other in a l...

Rationale: Although malnutrition is common across healthcare settings in the Netherlands, severity of malnutrition at the start of the dietary treatment in the primary care setting is unclear. We aimed to assess severity of malnutrition in adults clients with malnutrition (risk) at the start of their dietary treatment in the primary care setting. M...

Rationale: Although malnutrition is common across healthcare settings in the Netherlands, severity of malnutrition at the start of the dietary treatment in the primary care setting is unclear. We aimed to assess severity of malnutrition in adults clients with malnutrition (risk) at the start of their dietary treatment in the primary care setting. M...

Objective: Chemoradiotherapy (CRT) for head and neck cancer (HNC) is associated with high toxicity that adversely affects physical functioning, body composition, fatigue, quality of life and treatment outcomes. Exercise interventions during treatment might counteract these negative effects. We therefore assessed the feasibility of an exercise prog...

Twenty years ago, ESPEN published its “Guidelines for nutritional screening 2002”, with the note that these guidelines were based on the evidence available until 2002, and that they needed to be updated and adapted to current state of knowledge in the future. Twenty years have passed, and tremendous progress has been made in the field of malnutriti...

Background To improve older patients’ physical activity (PA) behavior, it is important to identify facilitators and barriers to enhancing PA in older patients (≥ 65 years) during hospitalization from the perspectives of patients, caregivers, and healthcare professionals (HCPs). Methods In this systematic review, a search of PubMed, CINAHL, PsycINF...

The aim of this study was to explore the association between oral health and frailty in community-dwelling Dutch adults aged 55 years and older. Included were 170 participants (n = 95 female [56%]; median age 64 years [IQR: 59-69 years]). Frailty was assessed by the Groningen Frailty Indicator. Oral health was assessed by the Oral Health Impact Pro...

Purpose Malnutrition and sarcopenia require dietetic and physiotherapy interventions. In this study, we aimed to compare interprofessional identity of dietitians and physiotherapists, as well as attitudes towards, facilitators and barriers for, and occurrence of interprofessional treatment of malnutrition and sarcopenia by both professions. Method...

Low muscle mass is associated with adverse outcomes after surgery. This study examined whether facial muscles, such as the masseter muscle, could be used as a proxy for generalized low muscle mass and could be associated with deviant outcomes after carotid endarterectomy (CEA). As a part of the Vascular Ageing study, patients with an available preo...

Restrictive measures due to the COVID-19 pandemic may cause problems in the physical, social, and psychological functioning of older people, resulting in increased frailty. In this cross-sectional study, we aimed to assess the prevalence and characteristics of frailty, to examine differences in perceived COVID-19-related concerns and threats betwee...

Maintaining or increasing physical activity (PA) may prevent loss of muscle mass and strength after completion of head and neck cancer (HNC) treatment. However, the exercise level of HNC patients may not meet PA guidelines. We aimed to explore HNC survivors’ views on PA, their report of PA, and to compare these with objectively measured PA. Combine...

Objective The aim of this scoping review was to identify and map available evidence concerning counseling strategies that contribute to effective DC. Methods Following the PRISMA SCR-Scoping Reviews Statement and Checklist, a systematic search in electronic databases was performed in March 2020. Results Synthesis of recurring themes in the 28 inc...

Older people are a high-risk group for coronavirus disease 2019 (COVID-19) because of a range of factors, including age-related changes in anatomical pulmonary and muscle function, decreased immunity and increased inflammation. These factors partly explain why older people with COVID-19 experience more severe symptoms and higher mortality than youn...

Purpose The Scored Patient-Generated Subjective Global Assessment (PG-SGA©) is a globally recognized and used nutritional screening, assessment, monitoring, and triaging tool. The aim of this study was to translate and culturally adapt the original English PG-SGA for the Japanese speaking populations and to assess its linguistic validity (i.e., com...

Background and aim The Patient-Generated Subjective Global Assessment (PG-SGA©) is a globally used malnutrition screening, assessment, triage and monitoring tool. The aim of this study was to perform a linguistic and content validation of the translated and culturally adapted version of the PG-SGA for the Danish setting. Method The study was condu...

Objectives Malnutrition is associated with a twofold higher risk of dying in patients with tuberculosis (TB) and considered an important potentially reversible risk factor for failure of TB treatment. The construct of malnutrition has three domains: intake or uptake of nutrition; body composition and physical and cognitive function. The objectives...

Background The proportion of frail older adults is increasing and is expected to further increase in the coming years, both globally and in the Dutch population. This poses a great challenge to public health. To determine the prevalence of frailty in a population, a frailty index (FI) is recommended. A FI is an accumulation model encompassing healt...

The aging process is often accompanied by increase in body weight. Older adults with overweight or obesity might have an overconsumption in energy that is accompanied by inadequate intake of protein, vitamin D, and calcium. It is unclear if intake of protein and vitamin D and calcium is sufficient in older adults with overweight/obesity, and whethe...

Background/objectives Traditional malnutrition screening instruments, including the Malnutrition Universal Screening Tool (MUST), strongly rely on low body mass index (BMI) and weight loss. In overweight/obese patients, this may result in underdetection of malnutrition risk. Alternative instruments, like the Patient-Generated Subjective Global Asse...

Background & Aims Malnutrition screening is a first step in the nutrition care process for hospitalized patients, to identify those at risk of malnutrition and associated worse outcome, preceding further assessment and intervention. Frequently used malnutrition screening tools including the Malnutrition Universal Screening Tool (MUST) mainly screen...

Background & aims Sarcopenia is defined as the age-related loss in muscle quantity and quality which is associated with physical disability. The assessment of muscle quantity plays a role in the diagnosis of sarcopenia. However, the methods used for this assessment have many disadvantages in daily practice and research, like high costs, exposure to...

Introduction: Disease-related undernutrition is highly prevalent and requires timely intervention. However, identifying undernutrition often relies on physician judgment. As Internal Medicine wards are the backbone of the hospital setting, insight into the prevalence of nutritional risk in this population is essential. We aimed to determine the pre...

Objective Malnutrition screening instruments used in hospitals mainly include criteria to identify characteristics of malnutrition. However, to tackle malnutrition in an early stage, identifying risk factors for malnutrition in addition to characteristics may be valuable. We aimed to determine the predictive validity of the Patient-Generated Subjec...

Background and Aims Patients with cancer frequently present with disease-related malnutrition and functional decline. The scored Patient-Generated Subjective Global Assessment (PG-SGA©) is a malnutrition screening and assessment tool commonly used in patients with cancer. The aim of the current study was to translate and culturally adapt the origin...

PurposeIn 2018, the SARCUS working group published a first article on the standardization of the use of ultrasound to assess muscle. Recommendations were made for patient positioning, system settings and components to be measured. Also, shortcomings in knowledge were mentioned. An important issue that still required standardization was the definiti...

Background & aims Malnutrition has a negative impact on quality of life and survival in renal transplant recipients (RTR). Therefore, malnutrition detection is important in RTR, but this may be hampered by concomitant presence of weight gain and overweight. Recently, the Global Leadership Initiative on Malnutrition (GLIM) developed a set of diagnos...

Rationale: Lean body mass, including muscle, is known to decrease with age, which may contribute to loss of physical function. Low quadriceps muscle status is considered an indicator of frailty in critically ill patients. However little is known about the relationship between muscle thickness and frailty in community dwelling adults. Therefore, we...

Rationale: Malnutrition is a common problem in patients with Chronic Obstructive Pulmonary Disease (COPD). Whereas estimation of fat-free muscle mass index (FFMi) with bio-electrical impedance is often used, less is known about muscle thickness measured with ultrasound (US) as a parameter for malnutrition. Moreover, it has been suggested that in th...

AIM We explored body mass index (BMI) and rectus femoris (RF) muscle thickness in patients with advanced COPD matched with healthy controls. METHODS • COPD patients starting a pulmonary rehabilitation program were matched with healthy controls for age (5 years), sex and stature (0.10 m) in a case control ratio of 1:4 • Height was measured with a st...