Regional Kale as Source of Lutein and Zeaxanthin to Improve Vision of AMD-patients (KALESIGHT)

Regional Kale as Source of Lutein and Zeaxanthin to Improve Vision of Patients With Age-related Macular Degeneration - an Alternative to Supplements With Isolated Xanthophylls

The age-related macular degeneration (AMD) is an age-dependent, multi-factorial disease. In Western industrial countries, it is the main cause of visual impairments. In Germany, approximately 4.5 million people suffer from AMD. Genetic as well as nutritional aspects are mainly important in AMD development. Until now, AMD-patients are advised to use supplements based on the carotenoids lutein and zeaxanthin, comprised in high doses and in isolated form. Results showing the effects of food items (kale, spinach) rich in lutein on improvement of vision are scarce. And how much is needed within the diet? Within the planned project, human intervention studies will investigate whether an oil-based kale extract or fresh kale can be used to improve vision of AMD-patients and persons aged 50+ (without AMD). The first study will use volunteers without AMD (>18 y) to investigate if there is a dose-dependent effect of lutein and zeaxanthin (out of a kale extract) on macular pigment optical density (MPOD). This study will also compare the bioavailability of the carotenoids from the extract and from a supplement. A second study (also using volunteers without AMD, >18 y) will compare the bioavailability of lutein and zeaxanthin from the extract and from kale purée. The third study will investigate the effect of the oil-based kale extract on improvements of MPOD and vision of AMD-patients and of a control group (volunteers 50+ without AMD).

Usually, the intestinal absorption of lutein and zeaxanthin is determined by analyzing changes in concentrations in blood plasma. A fast, non-invasive sampling will be evaluated to check the efficacy of an increased uptake of lutein. Thus, the project will test the usability of buccal mucosa cells to detect metabolic changes after an uptake of carotenoids. Besides, the determination of carotenoid contents in skin will be checked on its use as biomarker of carotenoids in plasma and macula.

Thus, the planned research project will evaluate two non-invasive markers of exposition on their usability as markers of absorption of lutein and zeaxanthin in blood and macula. In addition, the minimally needed dosage of lutein and zeaxanthin for AMD prevention will be determined to reduce the possible risk of currently recommended doses of these compounds. The project will also present alternatives (kale extract, kale purée) for AMD prevention and to improve vision to be used instead of currently used high-dose supplements.

Study Overview

• Status: Unknown
• Conditions: Changes in Macular Pigment Optical Density
• Intervention / Treatment: Dietary supplement: S1: Dosage-dependency; Other: S2: Kale extract versus kale purée; Other: S3: Kale extract: AMD-patients

• Study Type: Interventional
• Enrollment (Anticipated): 90
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Germany
  • Jena, Germany, 07743
    • Recruiting
    • University Eye Hospital, Friedrich Schiller University Jena

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• healthy, > 18 years, written consent

Exclusion Criteria:

• uptake of dietary supplements, glaucoma

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Prevention
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Quadruple

Number of Arms

14

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Placebo Comparator: S1-Placebo; placebo capsule with all ingredients, but without active compound, intervention for 4 weeks, S1: Dosage-dependency	Dietary supplement: S1: Dosage-dependency; kale extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein tagetes extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein, 10 mg lutein
Experimental: S1-1L; capsule containing 1 mg lutein out of kale, intervention for 4 weeks, S1: Dosage-dependency	Dietary supplement: S1: Dosage-dependency; kale extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein tagetes extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein, 10 mg lutein
Experimental: S1-2L; capsule containing 2 mg lutein out of kale, intervention for 4 weeks, S1: Dosage-dependency	Dietary supplement: S1: Dosage-dependency; kale extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein tagetes extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein, 10 mg lutein
Experimental: S1-5L; capsule containing 5 mg lutein out of kale, intervention for 4 weeks, S1: Dosage-dependency	Dietary supplement: S1: Dosage-dependency; kale extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein tagetes extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein, 10 mg lutein
Experimental: S2-Kale_extract	Other: S2: Kale extract versus kale purée
Experimental: S2-Kale_purée	Other: S2: Kale extract versus kale purée
Placebo Comparator: S3-Placebo	Other: S3: Kale extract: AMD-patients
Experimental: S3-AMD-Patients	Other: S3: Kale extract: AMD-patients
Experimental: S3-non-AMD	Other: S3: Kale extract: AMD-patients
Placebo Comparator: S1-Placebo-Tagetes; capsule containing all ingredients, but without active compound, intervention for 4 weeks, S1: Dosage-dependency	Dietary supplement: S1: Dosage-dependency; kale extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein tagetes extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein, 10 mg lutein
Experimental: S1-1L-Tagetes; capsule containing 1 mg lutein out of tagetes, intervention for 4 weeks, S1: Dosage-dependency	Dietary supplement: S1: Dosage-dependency; kale extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein tagetes extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein, 10 mg lutein
Experimental: S1-2L-Tagetes; capsule containing 2 mg lutein out of tagetes, intervention for 4 weeks, S1: Dosage-dependency	Dietary supplement: S1: Dosage-dependency; kale extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein tagetes extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein, 10 mg lutein
Experimental: S1-5L-Tagetes; capsule containing 5 mg lutein out of tagetes, intervention for 4 weeks, S1: Dosage-dependency	Dietary supplement: S1: Dosage-dependency; kale extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein tagetes extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein, 10 mg lutein
Experimental: S1-10L-Tagetes; capsule containing 10 mg lutein out of tagetes, intervention for 4 weeks, S1: Dosage-dependency	Dietary supplement: S1: Dosage-dependency; kale extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein tagetes extract: placebo, 1 mg lutein, 2 mg lutein, 5 mg lutein, 10 mg lutein

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
changes in macular pigment optical density MPOD [ODU: optical density units]	Changes from baseline to various time points for different parameters of MPOD will be measured: changes in mean MPOD [ODU], changes in max. MPOD [ODU], changes in volume of MPOD [ODU x (degree)2], changes in area of MPOD [degree2]	baseline and after 4/8 weeks, baseline and after 6/12/18/24 weeks

Collaborators and Investigators

• Sponsor: University of Jena

Publications and helpful links

General Publications

• Arnold C, Winter L, Frohlich K, Jentsch S, Dawczynski J, Jahreis G, Bohm V. Macular xanthophylls and omega-3 long-chain polyunsaturated fatty acids in age-related macular degeneration: a randomized trial. JAMA Ophthalmol. 2013 May;131(5):564-72. doi: 10.1001/jamaophthalmol.2013.2851.
• Arnold C, Jentsch S, Dawczynski J, Bohm V. Age-related macular degeneration: Effects of a short-term intervention with an oleaginous kale extract--a pilot study. Nutrition. 2013 Nov-Dec;29(11-12):1412-7. doi: 10.1016/j.nut.2013.05.012.

Study record dates

Study Major Dates

• Study Start: February 1, 2015
• Primary Completion (Anticipated): December 1, 2018
• Study Completion (Anticipated): December 1, 2020

Study Registration Dates

• First Submitted: May 6, 2014
• First Submitted That Met QC Criteria: May 8, 2014
• First Posted (Estimate): May 13, 2014

Study Record Updates

• Last Update Posted (Actual): May 8, 2018
• Last Update Submitted That Met QC Criteria: May 7, 2018
• Last Verified: May 1, 2018

More Information

Terms related to this study

• Other Study ID Numbers: BO 1511/8-1