Staff Profiles

Module Leader

• Introduction to Nutrition (BSc)
• Lifespan Nutrition (BSc)
• Functional Foods and Food Product Development (BSc)
• Health Promotion, Professional Practice, and Lifespan Nutrition (MSc)

I am also delivering lectures on topics related to Psychology and Sensory Science.

Supervision

My research centres on nutrition/dietary interventions, with a particular focus on the role of eating behaviour in ingestive decision making, weight regulation, and prevention and management of nutrition-related health conditions. My most recent projects aim at shedding some light on the debate around sugar and food ‘addiction’. I have also a long interest in malnutrition including sarcopenic obesity and led and/or be contributing to relevant clinical projects.

As part of my research, I have also developed and validated a 10-minute taste test to identify people with different hedonic responses to sweetness.

Journal articles

• Iatridi V, Quadt L, Hayes JE, Garfinkel SN, Yeomans MR, 'Female sweet-likers have enhanced cross-modal interoceptive abilities'
  Appetite 165 (2021)
  ISSN: 0195-6663 eISSN: 1095-8304
  Abstract

  There are well known phenotypic differences in sweet-liking across individuals, but it remains unknown whether these are related to broader underlying differences in interoceptive abilities (abilities to sense the internal state of the body). Here, healthy women (N = 64) classified as sweet likers (SLs) or sweet dislikers (SDs) completed a bimodal interoception protocol. A heartbeat tracking and a heartbeat discrimination task determined cardiac interoception; both were accompanied by confidence ratings. A water load task, where participants consumed water to satiation and then to maximum fullness was used to assess gastric interoceptive abilities. Motivational state, psychometric characteristics and eating behaviour were also assessed. SLs performed significantly better than SDs on both heartbeat tasks, independently of impulsivity, anxiety, depression, and alexithymia. No differences in metacognitive awareness and subjective interoceptive measures were found. With gastric interoception, SLs were more sensitive to stomach distention, and they ingested less water than SDs to reach satiety when accounting for stomach capacity. SLs also scored higher on mindful and intuitive eating scales and on emotional eating particularly in response to negative stimuli; emotional overeating was fully mediated via interoceptive performance. Overall, our data suggest the SL phenotype may reflect enhanced responsiveness to internal cues more broadly.
  

  Website 
• Armitage R, Chi V, Iatridi V, Yeomans MR, 'Understanding sweet-liker phenotypes: exploring habitual intake of Western diet, impulsivity and childhood eating experience'
  Appetite 157 (2021)
  ISSN: 0195-6663 eISSN: 1095-8304
  Abstract

  Phenotypic differences in sweet-liking are well known, but how they relate to actual eating behaviour, and what causes these differences in liking, remains unclear. Here we first explored if sweet liking phenotypes (sweet likers, sweet dislikers, and moderate likers) differed in habitual intake of high fat sugar Western diets, with 244 healthy volunteers (18-34 yo). Sweet likers more frequently consumed items with high sugar content. However, phenotypes did not differ in use of sweet-fat or savoury-fat items, implying sweet dislikers tolerated sweetness when consumed with fat. Secondly, using a childhood eating questionnaire, we investigated whether phenotypic differences in sweet liking reflected differences in childhood food experience: no differences were found. Finally, we examined phenotypic differences in impulsivity (using Barratt Impulsiveness Scale - BIS) and reward sensitivity (using Arnett’s Inventory of Sensation Seeking - AISS). No differences were found on the BIS scores, but sweet likers scored higher on the intensity measure of the AISS. These data confirm that phenotypic differences in sweet liking do reflect habitual use of sugar-rich foods and drinks, suggesting a wider difference in reward sensitivity.
  

  Website 
• V Iatridi, RM Armitage, MR Yeomans, JE Hayes, 'Effects of Sweet-Liking on Body Composition Depend on Age and Lifestyle: A Challenge to the Simple Sweet-Liking—Obesity Hypothesis'
  Nutrients 12 (9) (2020)
  ISSN: 2072-6643 eISSN: 2072-6643
  Abstract

  Taste hedonics drive food choices, and food choices affect weight maintenance. Despite this, the idea that hyper-palatability of sweet foods is linked to obesity development has been controversial for decades. Here, we investigate whether interpersonal differences in sweet-liking are related to body composition. Healthy adults aged 18–34 years from the UK (n = 148) and the US (n = 126) completed laboratory-based sensory tests (sucrose taste tests) and anthropometric measures (body mass index; BMI, body fat; fat-free mass; FFM, waist/hips circumferences). Habitual beverage intake and lifestyle and behavioural characteristics were also assessed. Using hierarchical cluster analysis, we classified participants into three phenotypes: sweet liker (SL), sweet disliker (SD), and inverted-U (liking for moderate sweetness). Being a SD was linked to higher body fat among those younger than 21 years old, while in the older group, SLs had the highest BMI and FFM; age groups reflected different levels of exposure to the obesogenic environment. FFM emerged as a better predictor of sweet-liking than BMI and body fat. In the older group, sweetened beverage intake partially explained the phenotype–anthropometry associations. Collectively, our findings implicate underlying energy needs as an explanation for the variation in sweet-liking; the moderating roles of age and obesogenic environment require additional consideration.
  

  Website 
• Iatridi V, Hayes JE, Yeomans MR, 'Quantifying sweet taste liker phenotypes: Time for some consistency in the classification criteria'
  Nutrients 11 (1) (2019)
  ISSN: 2072-6643 eISSN: 2072-6643
  Abstract

  Taste hedonics is a well-documented driver of food consumption. The role of sweetness in directing ingestive behavior is largely rooted in biology. One can then intuit that individual differences in sweet-liking may constitute an indicator of variations in the susceptibility to diet-related health outcomes. Despite half a century of research on sweet-liking, the best method to identify the distinct responses to sweet taste is still debated. To help resolve this issue, liking and intensity ratings for eight sucrose solutions ranging from 0 to 1 M were collected from 148 young adults (29% men). Hierarchical cluster analysis (HCA) revealed three response patterns: a sweet-liker (SL) phenotype characterized by a rise in liking as concentration increased, an inverted U-shaped phenotype with maximum liking at 0.25 M, and a sweet-disliker (SD) phenotype characterized by a decline in liking as a function of concentration. Based on sensitivity and specificity analyses, present data suggest the clearest discrimination between phenotypes is seen with 1.0 M sucrose, where a liking rating between −15 and +15 on a −50/+50 scale reliably distinguished individuals with an inverted U-shaped response from the SLs and the SDs. If the efficacy of this approach is confirmed in other populations, the discrimination criteria identified here can serve as the basis for a standard method for classifying sweet taste liker phenotypes in adults. 
  

  Website 
• Iatridi V, Hayes JE, Yeomans MR, 'Reconsidering the classification of sweet taste liker phenotypes: A methodological review'
  Food Quality and Preference 72 (2019) pp.56-76
  ISSN: 0950-3293
  Abstract

  Human ingestive behavior depends on myriad factors, including both sensory and non-sensory determinants. Of the sensory determinants, sweet taste is a powerful stimulus and liking for sweetness is widely accepted as an innate human trait. However, the universality of sweet-liking has been challenged. Sub-groups exhibiting strong liking (sweet likers) or having aversive responses to sweet taste (sweet dislikers) have been described, but the methods defining these phenotypes are varied and inconsistent across studies. Here, we explore the strengths and weaknesses of different methodological approaches in identifying sweet taste liker phenotypes in a comprehensive review. Prior studies (N = 71) using aqueous sucrose solution-based taste tests and a definition of two or more distinct hedonic responses reported between 1970 and 2017 were summarized. Broadly speaking, four different phenotyping methods have been used: 1. Interpretation (visual or statistical) of the shape of hedonic response curves, 2. Highest preference using ratings, 3. Average liking above mid-point or Positive/Negative average liking method, and 4. Highest preference via paired comparisons. Key methodological weaknesses included the use of subjective or arbitrary criteria as well as adoption of protocols unsuitable for large-scale implementation. Overall, we did not identify a method distinctly superior to the others. Given the role of both hedonics and reward in food intake, a better understanding of individual variations in sweet taste perception could clarify how sweet-liking interplays with obesity or addictive behaviors such as alcohol misuse and abuse. The development of a universally used statistically robust and less time-consuming classification method is needed.
  

  Website 
• Karatzi K, Moschonis G, Choupi E, Manios Y, Skenderi KP, Grammatikaki E, Androutsos O, Tanagra S, Koumpitski A, Siatitsa PE, Vandorou A, Kyriakou AE, Dede V, Kantilafti M, Farmaki AE, Siopi A, Micheli S, Damianidi L, Margiola P, Gakni P, Iatridi V, Mavrogianni C, Michailidou K, Giannopoulou A, Argyri E, Maragkopoulou K, Spyridonos M, Tsikalaki E, Kliasios P, Naoumi A, Koutsikas K, Aggelou E, Krommyda Z, Aga C, Birbilis M, Kosteria I, Zlatintsi A, Voutsadaki E, Papadopoulou EZ, Papazi Z, Papadogiorgakaki M, Chlouveraki F, Lyberi M, Karatsikaki-Vlami N, Dionysopoulou E, Daskalou E, 'Late-night overeating is associated with smaller breakfast, breakfast skipping, and obesity in children: The Healthy Growth Study'
  Nutrition 33 (2017) pp.141-144
  ISSN: 0899-9007
  Abstract

  Objective. Excessive energy intake during evening hours is associated with several health problems. The aim of this study was to investigate for the first time the possible association of late-night overeating with breakfast habits and obesity in a large sample of Greek children ages 9 to 13 y.

  Methods. In all, 2655 schoolchildren (9–13 y) participated in the Healthy Growth Study, a cross-sectional epidemiologic study conducted in 77 primary schools in four large regions in Greece. The present study presents results on 1912 children having full data regarding anthropometric, dietary, physical activity, and physical examination indices.

  Results. High-energy intake at dinner and evening snack was associated with higher likelihood of skipping breakfast (odds ratio, 1.85; 95% confidence interval 1.42–2.39) and with lower caloric intake at breakfast (β = 0.14; P < 0.001). Children at the lowest quartile of physical activity levels were found to have a positive association between the calories consumed at dinner and their body mass index (β = 0.11; P = 0.019). This association was inverse for children at the highest quartile of physical activity levels (β = −0.10; P = 0.033).

  Conclusions, Late-night overeating is associated with skipping and/or consuming a smaller breakfast. In children with low levels of physical activity, it is associated with increased body mass index. Future relevant studies are essential to further explore and confirm the findings of the present study.

  Website 
• Karatzi K, Moschonis G, Polychronopoulou MC, Chrousos GP, Lionis C, Manios Y, Skenderi KP, Grammatikaki E, Androutsos O, Tanagra S, Koumpitski A, Siatitsa PE, Vandorou A, Kyriakou AE, Dede V, Kantilafti M, Farmaki AE, Siopi A, Micheli S, Damianidi L, Margiola P, Gakni P, Iatridi V, Mavrogianni C, Michailidou K, Giannopoulou A, Argyri E, Maragkopoulou K, Spyridonos M, Tsikalaki E, Kliasios P, Naoumi A, Koutsikas K, Aggelou E, Krommyda Z, Aga C, Birbilis M, Kosteria I, Zlatintsi A, Voutsadaki E, Papadopoulou EZ, Papazi Z, Papadogiorgakaki M, Chlouveraki F, Lyberi M, Karatsikaki-Vlami N, Dionysopoulou E, Daskalou E, 'Cutoff points of waist circumference and trunk and visceral fat for identifying children with elevated inflammation markers and adipokines: The Healthy Growth Study'
  Nutrition 32 (10) (2016) pp.1063-1067
  ISSN: 0899-9007
  Abstract

  Objectives. Excessive fat storage is accompanied by several comorbidities in children and early identification of elevated abdominal fat may be extremely valuable in early prevention of cardiometabolic risk. The aim of the present study was to establish cutoff points for waist circumference trunk and visceral fat, thus identifying increased likelihood of elevated inflammatory markers and adipokines in children.

  Methods. A representative sample of schoolchildren (aged 9–13 y) participated in a cross-sectional epidemiologic study conducted in Greece. Anthropometric and physical examination data, biochemical indices, and socioeconomic information (collected from parents) were assessed for all children. Central adiposity markers (trunk and visceral fat) were collected with bioelectrical impedance analysis for 999 children.

  Results. Specific cutoff values of abdominal adiposity indices indicating increased likelihood of elevated levels of C-reactive protein, interleukin-6, and leptin and decreased levels of adiponectin were calculated by sex. These cutoff values were; 67.5 cm for boys and 69.5 cm for girls for waist circumference, 17.75% for boys and 22.65% for girls for trunk fat mass percentage, and 3.95 for boys and 2.55 for girls for visceral fat rating.

  Conclusions. To our knowledge, this is the first study to establish simple cutoff points for abdominal adiposity indices identifying children at high risk for elevated inflammatory markers and decreased adipokine levels. Future studies are essential to confirm these findings.

  Website 
• Tsirigoti L, Kontogianni MD, Darema M, Iatridi V, Altanis N, Poulia KA, Zavos G, Boletis J, 'Exploring associations between anthropometric indices and graft function in patients receiving renal transplant'
  Journal of Human Nutrition and Dietetics 29 (1) (2016) pp.52-58
  ISSN: 0952-3871 eISSN: 1365-277X
  Abstract

  Background
  The aim of the present study was to identify indicators of malnutrition, as obtained by anthropometric measurements, that might be potential predictors of transplant outcomes.

  Methods
  One hundred and three patients receiving a graft from a living or a deceased donor were included in this prospective study. Body mass index (BMI) based on pretransplant dry body weight, triceps skinfold, mid‐arm muscle circumference and corrected mid‐arm muscle area were measured. Post‐transplant data on delayed graft function (DGF) and glomerular filtration rate (GFR) at discharge were collected until patient discharge.

  Results
  Delayed graft function developed in 36.9% of the patients. BMI was the only anthropometric variable associated with a higher likelihood of DGF (odds ratio = 1.25, 95% confidence interval = 1.07–1.47) after adjusting for age, gender, donor group, donor age and years of dialysis before transplantation. Obesity was associated with a higher frequency of DGF (83.3% versus 31.1%, P = 0.001) compared to normal weight. GFR at discharge was negatively associated with BMI [β = −0.014 (0.005), P = 0.004], being overweight [β = −0.151 (0.041), P < 0.001] and obesity [β = −0.188 (0.053), P = 0.001], after adjusting for age, gender, donor group, donor age and years of dialysis, but was not associated with indices of muscle reserves.

  Conclusions
  The likelihood of DGF was higher among obese patients, whereas GFR at discharge was negatively associated with being overweight and obesity.

  Website 
• Poulia KA, Tsirigoti L, Darema M, Altanis N, Iatridi V, Zavos G, Boletis J, Kontogianni M, 'Evaluation of Three Nutritional Screening Tools for Patients with Chronic Kidney Disease Under Dialysis by the Method of Triads'
  Clinical Nutrition ESPEN 33 (S1) (2014) pp.S90-S91
  ISSN: 2405-4577 eISSN: 2405-4577
  Website 
• Manios Y, Moschonis G, Papandreou C, Siatitsa PE, Iatridi V, Lidoriki I, Lionis C, Chrousos GP on behalf of the Healthy Growth Study group, 'Female sex, small size at birth and low family income increase the likelihood of insulin resistance in late childhood: the Healthy Growth Study'
  Pediatric Diabetes 15 (1) (2014) pp.41-50
  ISSN: 1399-543X eISSN: 1399-5448
  Abstract

  Objective. To identify among a wide range of perinatal indices, as well as certain family sociodemographic and parental characteristics, those independently associated with insulin resistance (IR) in late childhood.

  Methods. A representative sample of 2195 Greek schoolchildren, aged 9–13 yr, was examined, and based on the biochemical indices collected IR was estimated using the homeostasis model assessment (HOMA‐IR < 3.16). Perinatal data were recorded from children's medical records, retrospectively, while family sociodemographics and parental anthropometrics were reported by parents.

  Results. The overall prevalence of IR was 28.4%, with a higher prevalence observed for girls compared with boys (p <0.05). Examination of univariate associations, per se, showed that maternal current and pre‐pregnancy overweight/obesity, maternal smoking at early pregnancy, children's small birth weight, and rapid growth at infancy as well as female sex and non‐Caucasian race increased the likelihood of IR. In contrast, folate supplementation during pregnancy, as well as higher paternal education and annual family income decreased the likelihood of IR in children. Inclusion of all above variables at a multivariable regression model highlighted female sex [odds ratios (OR): 1.67, 95% confidence intervals (CI): 1.30–2.13], small birth weight (OR: 1.41, 95% CI: 1.03–2.01), and higher annual family income (OR: 0.71, 95% CI: 0.53–0.95 for 12 000–30 000 € and OR: 0.68, 95% CI: 0.48–0.96 for >30 000 €) as the only significant correlates of IR after also controlling for children's body mass index (BMI) and Tanner stage.

  Conclusions. The current study highlighted small birth weight and female sex as the only perinatal factors independently associated with the occurrence of IR in late childhood, when examined at a multivariable level with a wide range of perinatal indices as well as certain family sociodemographic and parental characteristics.

  Website 
• Tsirigoti L, Kontogianni M, Darema M, Altanis N, Iatridi V, Poulia KA, Zavos G, Boletis J, 'Nutritional status affects graft function in patients receiving renal transplant'
  Clinical Nutrition ESPEN 32 (S1) (2013) pp.S75-S76
  ISSN: 2405-4577 eISSN: 2405-4577
  Website 
• Moschonis G, Mavrogianni C, Karatzi K, Iatridi I, Chrousos GP, Lionis C, Manios Y, 'Increased physical activity combined with more eating occasions is beneficial against dyslipidemias in children. The Healthy Growth Study'
  European Journal of Nutrition 52 (2012) pp.1135-1144
  ISSN: 1436-6207 eISSN: 1436-6215
  Abstract

  Purpose.
  To identify lifestyle patterns associated with blood lipid levels in children.

  Methods.
  A representative sample of 2,043 schoolchildren (9–13 years) participated in a cross-sectional epidemiologic study conducted in 77 primary schools in four large regions in Greece. Dietary intakes, breakfast patterns and eating frequency, physical activity levels, sleep duration, anthropometric and physical examination data, biochemical indices and socioeconomic information (collected from parents) were assessed in all children. Principal component analysis was used to identify the lifestyle patterns.

  Results.
  A lifestyle pattern of more screen time, shorter sleep duration and higher sugar-sweetened beverage consumption was inversely associated with HDL cholesterol (β = −0.077; P < 0.001) and positively associated with total/HDL cholesterol ratio (β = 0.049; P = 0.025). Furthermore, a lifestyle pattern of more eating occasions and higher moderate-to-vigorous physical activity (MVPA) levels was inversely associated with total cholesterol (β = −0.064; P = 0.006), LDL (low-density lipoprotein) cholesterol (β = −0.065; P = 0.004) and total/HDL (high-density lipoprotein) cholesterol ratio (β = −0.043; P = 0.049) in multivariate models. Finally, children with MVPA levels and eating frequency higher than that corresponding to the second quartile of this lifestyle pattern (i.e., > 44.8 min of MVPA per day and > 4.7 meals per day) were 29.7, 32.6 and 43.1 % less likely of having abnormal levels of total cholesterol, LDL and total/HDL cholesterol ratio, respectively, according to the National Cholesterol Education Program (NCEP) cutoff points.

  Conclusions.
  A lifestyle pattern of more than approximately 45 min of MVPA and 5 eating occasions per day was significantly associated with reduced likelihood of dyslipidemias in schoolchildren (9–13 years).

  Website 
• Moschonis G, Iatridi V, Mavrogianni C, Siatitsa PE, Kyriakou AE, Dede V, Skouli G, Sakellaropoulou A, Manios Y, 'Accuracy and correlates of visual and verbal instruments assessing maternal perceptions of children's weight status: the Healthy Growth Study'
  Public Health Nutrition 14 (11) (2011) pp.1979-1987
  ISSN: 1368-9800 eISSN: 1475-2727
  Abstract

  Objective
  To examine the accuracy of maternal ability to classify their children's weight status correctly using a verbal and a visual classification instrument and to detect significant correlates of maternal misperceptions.

  Design. Cross-sectional study.

  Setting. Primary schools in four counties from north, west, central and south Greece.

  Subjects. A representative sample of 1858 primary-school children aged 9–13 years was examined. Two different instruments to assess maternal perceptions of their children's weight status, i.e. a verbal and a visual one, were used.

  Results. Verbal and visual maternal underestimation rates of children's weight status were 15·0 % and 41·3 %, respectively. The frequency of underestimation was much higher among overweight and obese children for both instruments. The highest underestimation rates of 87·9 % and 82·1 % in overweight and obese boys, respectively, were obtained with the visual instrument. Multiple logistic regression modelling revealed that the likelihood of both verbal and visual maternal underestimation of their children's weight status was significantly higher for overweight mothers and for those with a lower educational level. Furthermore, children's male gender and a nanny or someone other than the mother as the child's primary caregiver were found to increase the odds of visual and verbal maternal underestimation of children's weight status, respectively.

  Conclusions. The present study showed that the verbal instrument used to assess maternal perceptions of their children's weight status was more accurate compared with the visual one. However, both instruments showed that a considerable number of overweight and obese boys had their weight status underestimated by their mothers. Educating mothers to classify their children's weight status correctly might be a key factor for the implementation of successful childhood obesity prevention initiatives.

  Website 

Membership of professional bodies

Association for Nutrition

Hellenic Dietetic Association

Nutrition Society

Society for the Study of Ingestive Behaviour

Consultancy

Further information