Tauseef Ahmad Khan

Tauseef Ahmad Khan
University of Toronto | U of T · Department of Nutritional Sciences

MBBS, MSc, PhD

About

120
Publications
32,945
Reads
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2,307
Citations
Introduction
sweeteners (honey, sugars, low-calorie sweeteners), dose-response meta-analysis, lifestyle, nutritional epidemiology, systematic reviews, cardiometabolic risk
Additional affiliations
November 2020 - present
University of Toronto
Position
  • Research Associate
September 2015 - present
St. Michael's Hospital
Position
  • PostDoc Position
September 2015 - present
University of Toronto
Position
  • PostDoc Position

Publications

Publications (120)
Article
We aimed to evaluate the relationships between body fat percentage (BF%), fat mass (FM), fat mass index (FMI) and visceral (VAT) and subcutaneous adipose tissue (SAT) with risk of all-cause mortality. We did a systematic search in PubMed, Scopus, and Web of Science to June 2021. We selected prospective cohorts of the relationship between body fat w...
Article
Objectives Sugar-sweetened beverages (SSBs) have been increasingly linked to the obesity epidemic, however, the evidence on 100% fruit juice and body weight remains controversial. The objective of this research was to synthesize the available evidence on SSBs and 100% fruit juice on body weight in children and adults. Methods MEDLINE, EMBASE, and...
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We did this study to clarify the association between carbohydrate intake and the risk of type 2 diabetes (T2D) and potential effect modification by geographical location. PubMed, Scopus and Web of Science were searched to find prospective cohort studies of dietary carbohydrate intake and T2D risk. A random-effects dose–response meta-analysis was pe...
Article
Background: We aimed to systematically review the literature and test the dose-response relationship between adherence to the Mediterranean diet (MedDiet) and values of bone mineral density (BMD) in adults. Methods: Relevant observational studies were selected through searching PubMed, Scopus, and Web of Science databases up to March 4, 2021. A...
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We aimed to summarize the associations between food sources of fructose and cardiovascular diseases (CVD), cancer, and all-cause mortality risk using a systematic review and meta-analysis. We searched PubMed, Scopus, and Web of Science up to November 2020. We included cohort studies that investigated the relationship between mortality risk (all-cau...
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The Portfolio Diet, a plant-based portfolio of cholesterol-lowering foods, has been shown to reduce low-density lipoprotein cholesterol (LDL-C), and other cardiovascular risk factors, in randomized controlled trials (RCTs). It is not known if these beneficial effects translate to a lower incidence cardiovascular disease (CVD) risk. To support exami...
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Objective To inform the update of the European Association for the Study of Diabetes clinical practice guidelines for nutrition therapy. Design Systematic review and meta-analysis of randomised controlled trials. Data sources Medline, Embase, and the Cochrane Library searched up to 13 May 2021. Eligibility criteria for selecting studies Randomis...
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Context: Rare sugars are monosaccharides and disaccharides (found in small quantities in nature) that have slight differences in their chemical structure compared with traditional sugars. Little is known about their unique physiological and cardiometabolic effects in humans. Objective: The objective of this study was to conduct a systematic revi...
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Objectives Health authorities recommend reducing added or free sugars to ≤5–10% energy. Much attention has focussed of the reduction of SSBs with the recommendation that SSBs be replaced with unsweetened healthy alternatives such as water but not non-nutritive sweetened beverages (NSBs). There are concerns that non-nutritive sweeteners do not have...
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Objectives Sugars have been implicated in the epidemic of obesity. It is unclear whether food sources of fructose-containing sugars other than sugar-sweetened beverages (SSBs) are associated with increased risk of obesity. To assess the evidence of the relation of food sources of fructose-containing sugars with incident overweight or obesity, we un...
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Objectives Intermittent fasting (IF) is a popular trending diet, yet there is limited evidence-based support considering its clinical impact on cardiometabolic outcomes. In an effort to inform the European Association for the Study of Diabetes (EASD) clinical practice guidelines for nutrition therapy, we conducted a network meta-analysis of randomi...
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Objectives Current approved health claims in Canada, US and Europe recognize the ability of oat ß-glucan to lower blood cholesterol; however, its ability to improve glycemic control is less certain. We undertook a systematic review and meta-analysis of randomized controlled trials to update the evidence of the effect of oats and oat-fiber on marker...
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Objectives Fructose as a source of excess calories increases non-alcoholic fatty liver disease (NAFLD) markers. Whether this effect is mediated by the food matrix is unknown. We thus conducted a systematic review and meta-analysis of controlled feeding trials assessing the effect of important food sources of fructose-containing sugars at different...
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Objectives Plant-based diets defined by limited animal food consumption have been extensively associated with cardiometabolic health benefits in Western nations. Diet indices are increasingly used to distinguish the protective characteristics of a plant-based diet at different levels of adherence. We aimed to synthesize evidence on the association...
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Objectives The efficacy of oat beta-glucan (OBG), a viscous soluble fibre, on postprandial glycemic outcomes may depend on the nature of the control and the dose and molecular weight (MW) utilized. We undertook a systematic review and meta-analysis of acute clinical trials to determine whether these features mediate the glycemic and insulinaemic re...
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Objectives The association between body mass index (BMI) and total body adiposity differs across ethnic groups. For instance, South Asians (SA) and East Asians (EA) have lower body fat for a given BMI level than Europeans, while the opposite is true for African-Caribbeans (AC). This suggests that the relationship between BMI and type 2 diabetes (T2...
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Objectives Sugar-sweetened beverages (SSBs) have been linked to weight gain. It is unclear if other food sources of fructose-containing sugars behave similarly. We conducted a systematic review and meta-analysis of controlled feeding trials to assess the effect of different food sources of fructose-containing sugars on body weight and markers of ad...
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Objectives Excess calories from free sugars have been implicated in the epidemics of obesity and type 2 diabetes. Honey has been lumped into the category of free sugars according to the World Health Organization but is considered a healthy alternative to sugar by many in the public. The objective of this study was to assess the effect of honey on c...
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Objectives Low-glycemic index (GI) and load (GL) dietary patterns are recommended for diabetes management by clinical practice guidelines globally. To inform the update of the European Association for the Study of Diabetes (EASD) clinical practice guidelines for nutrition therapy, we conducted a systematic review and meta-analysis on the effect of...
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Objectives Fructose providing excess calories has been shown to increase postprandial triglycerides (TAG). Whether this effect holds for different food sources of fructose-containing sugars is unclear. We conducted a systematic review and meta-analysis of controlled feeding trials on the effect of different food sources of fructose-containing sugar...
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Objectives Fructose as a source of excess calories increases uric acid. Whether this effect is mediated by the food matrix at different levels of energy is unknown. We aim to conduct a systematic review and meta-analysis of controlled feeding trials on the effect of food sources of fructose-containing sugars at different energy levels on uric acid...
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Objectives Excess calories as fructose may initiate pathways increasing biomarkers of inflammation. Whether this effect is mediated by the food matrix at different energy levels is unknown. We conducted a systematic review and meta-analysis of controlled feeding trials of the effect of food sources of fructose-containing sugars at different energy...
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Objectives Overconsumption of fructose-containing sugars may increase blood pressure. Whether this effect is mediated by the food matrix is unclear. We conducted a systematic review and meta-analysis of controlled feeding trials of the effect of food sources of fructose-containing sugars at different levels of energy control on blood pressure (NCT0...
Article
Background Although fructose as a source of excess calories increases uric acid, the effect of the food matrix is unclear. Objectives To assess the effects of fructose-containing sugars by food source at different levels of energy control on uric acid, we conducted a systematic review and meta-analysis of controlled trials. Methods MEDLINE, Embas...
Preprint
Objective: Traditional pairwise meta-analyses indicated that nuts consumption can improve blood pressure. We aimed to determine the dose-dependent effect of nuts on systolic (SBP) and diastolic blood pressure (DBP) in adults. Methods: A systematic search was undertaken in PubMed, Scopus, and ISI Web of Science till March 2021. Randomized controlled...
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Aims To evaluate the long-term consequences of coffee drinking in patients with type 2 diabetes. Data synthesis PubMed, Scopus, and Web of Sciences were searched to November 2020 for prospective cohort studies evaluating the association of coffee drinking with risk of cardiovascular disease (CVD) and mortality in patients with type 2 diabetes. Two...
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Background: Dietary recommendations and policies should be guided by rigorous systematic reviews. Reviews that are of poor methodological quality may be ineffective or misleading. Most of the evidence in nutrition comes from nonrandomized studies of nutritional exposures (usually referred to as nutritional epidemiology studies), but to date method...
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To determine the effect of oat β‑glucan (OBG) on acute glucose and insulin responses and identify significant effect modifiers we searched the MEDLINE, EMBASE, and Cochrane databases through October 27, 2020 for acute, crossover, controlled feeding trials investigating the effect of adding OBG (concentrate or oat-bran) to carbohydrate-containing te...
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Background Dietary fiber has played a consistent role in weight management, with efficacy potentially attributed to increased viscous fiber consumption.PurposeTo summarize the effects of viscous fiber on body weight and other anthropometric parameters, along with a calorie-deficient diet, through a systematic review and meta-analysis.MethodsMEDLINE...
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Background Public health policies reflect concerns that certain fruit sources may not have the intended benefits and that vegetables should be preferred to fruit. We assessed the relation of fruit and vegetable sources with cardiovascular outcomes using a systematic review and meta‐analysis of prospective cohort studies. Methods and Results MEDLIN...
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Objective To quantify the association of indices of central obesity, including waist circumference, hip circumference, thigh circumference, waist-to-hip ratio, waist-to-height ratio, waist-to-thigh ratio, body adiposity index, and A body shape index, with the risk of all cause mortality in the general population, and to clarify the shape of the dos...
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Recent data from randomized clinical trials (RCTs) suggest that DHA may have stronger anti-inflammatory effects than EPA. This body of evidence has not yet been quantitatively reviewed. The aim of this study was to compare the effect of DHA and EPA on several markers of systemic inflammation by pairwise and network meta-analyses of RCTs. MEDLINE, E...
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We aimed to investigate the association of dietary fiber consumption with mortality risk in women with breast cancer. A systematic search was undertaken in PubMed, Scopus, and ISI Web of Science till March 2020 to find cohort studies investigating the association of dietary fiber consumption with mortality risk in women with breast cancer. A random...
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Objective: We aim to synthesize effects of repeated administration (≥3 days) of inorganic nitrate on blood pressure and arterial stiffness measures. Methods: We conducted a systematic review and meta-analysis of randomized controlled trials with at least 3 days treatment of inorganic nitrate on blood pressure and arterial stiffness in individual...
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Importance Sugar-sweetened beverages (SSBs) are associated with increased risk of metabolic syndrome (MetS). However, the role of other important food sources of fructose-containing sugars in the development of MetS remains unclear. Objective To examine the association of major food sources of fructose-containing sugars with incident MetS. Data S...
Article
Objectives The efficacy of oat beta-glucan (OBG), a viscous soluble fibre, on postprandial glycemic outcomes may depend on the nature of the control and the dose and molecular weight (MW) utilized. We undertook a systematic review and meta-analysis of acute clinical trials to determine whether these features mediate the glycemic response to OBG. M...
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Full-text available
Objectives Nordic dietary patterns may have a role in diabetes management. To inform the update of the European Association for the Study of Diabetes (EASD) clinical practice guidelines, we conducted a systematic review and meta-analysis of Nordic dietary patterns and cardiometabolic outcomes. Methods We searched Cochrane, MEDLINE, and EMBASE thro...
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Objectives The aim of this study was to compare the effect of DHA and EPA on several markers of systemic inflammation by pairwise and network meta-analyses of randomized controlled trials (RCTs). Methods MEDLINE, EMBASE and The Cochrane Library were searched through September 2019. We included RCTs of ≥ 7 days that directly compared the effects of...
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Objectives Sugar-sweetened beverages (SSBs) have been linked to weight gain, and it is unclear if other food sources of fructose-containing sugars behave similarily. We conducted a systematic review and meta-analysis of controlled feeding trials to assess the effect of different food sources of fructose-containing sugars on body weight. Methods ME...
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Objectives Concerns exist that NSBs do not have established benefits, with major dietary guidelines recommending that water and not NSBs replace sugar-sweetened beverages (SSBs). Whether NSBs improve cardiometabolic risk factors similar to water in their intended substitution for SSBs is unclear. To inform the update of the European Association for...
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Objectives Low calorie sweetened beverages (LCSBs) are associated with increased cardiometabolic diseases using prevalent exposure of LCSBs. Although this association is at high risk of reverse causality, it has led to concerns that LCSBs may not have the intended benefits, with recommendations to replace sugar-sweetened beverage (SSBs) with water...
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Objectives Sugars have been implicated in the epidemic of obesity. It is unclear whether food sources of fructose-containing sugars other than sugar-sweetened beverages (SSBs) are associated with increased risk of obesity. To assess the evidence of the relation of food sources of fructose-containing sugars with incident overweight or obesity, we un...
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Full-text available
Aims To synthesize the evidence of the effect of small doses (<30-g/meal) of fructose and its epimers (allulose, tagatose, and sorbose) on the postprandial glucose and insulin response to carbohydrate-containing meals. Methods MEDLINE, EMBASE, and the Cochrane Central Register of Controlled Trials were searched through to April 9, 2019. We include...
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Background: The role of dietary fiber in obesity management remains debatable. Evidence suggests that intake of viscous fiber may have the potential to facilitate weight loss. Objective: We aimed to summarize and quantify the effects of viscous fiber on body weight, BMI, waist circumference, and body fat, independent of calorie restriction, thro...
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Objective: To determine the association of total and added fructose-containing sugars on cardiovascular (CVD) incidence and mortality. Methods: MEDLINE, EMBASE and Cochrane Library were searched from January 1, 1980, to July 31, 2018. Prospective cohort studies assessing the association of reported intakes of total, sucrose, fructose and added sug...
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Background Sugar‐sweetened beverages are associated with hypertension. We assessed the relation of important food sources of fructose‐containing sugars with incident hypertension using a systematic review and meta‐analysis of prospective cohort studies. Methods and Results We searched MEDLINE , EMBASE, and Cochrane (through December week 2, 2018)...
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Prevention of type 2 diabetes (T2D) is a great challenge worldwide. The aim of this evidence synthesis was to summarize the available evidence in order to update the European Association for the Study of Diabetes (EASD) clinical practice guidelines for nutrition therapy. We conducted a systematic review and, where appropriate, meta-analyses of rand...
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To update the European Association for the Study of Diabetes clinical practice guidelines for nutrition therapy, we conducted an umbrella review and updated systematic review and meta-analysis (SRMA) of prospective cohort studies of the association between dietary pulses with or without other legumes and cardiometabolic disease outcomes. We searche...
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Background: Vegetarian dietary patterns are recommended for cardiovascular disease (CVD) prevention and management due to their favorable effects on cardiometabolic risk factors, however, the role of vegetarian dietary patterns in CVD incidence and mortality remains unclear.Objective: To update the European Association for the Study of Diabetes (EA...
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Objective Sugar-sweetened beverages (SSBs) are associated with hyperuricaemia and gout. Whether other important food sources of fructose-containing sugars share this association is unclear. Design To assess the relation of important food sources of fructose-containing sugars with incident gout and hyperuricaemia, we conducted a systematic review a...
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Objective: The evidence for liquid meal replacements in diabetes has not been summarized. Our objective was to synthesize the evidence of the effect of liquid meal replacements on cardiometabolic risk factors in overweight/obese individuals with type 2 diabetes. Research design and methods: Data sources included MEDLINE, EMBASE, and the Cochrane...
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Background Certain plant foods (nuts and soy protein) and food components (viscous fibers and plant sterols) have been permitted by the FDA to carry a heart health claim based on their cholesterol-lowering ability. The FDA is currently considering revoking the heart health claim for soy protein due to a perceived lack of consistent LDL cholesterol...
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To update the clinical practice guidelines for nutrition therapy of the European Association for the Study of Diabetes, we conducted a systematic review and meta-analysis of prospective cohort studies and randomized clinical trials (RCTs) to evaluate the effect of the Mediterranean diet (MedDiet) on the prevention of cardiovascular disease (CVD) in...