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Diet rich in -lactalbumin improves memory in unmedicated recovered depressed patients and matched controls

Wendelien Merens

Department of Psychology, Leiden University, Leiden, The Netherlands

C. Rob Markus

Faculty of Psychology, Maastricht University, Maastrict, The Netherlands

A. J. Willem Van der Does

Department of Psychology, Leiden University and Department of Psychiatry, Leiden University Medical Center, Leiden, The Netherlands

Depression is associated with reduced brain serotonin (5-hydroxytryptamine; 5-HT) function and with cognitive dysfunctions. A diet rich in -lactalbumin protein has been found to increase the ratio tryptophan /large neutral amino acids (Trp/LNAA), and to improve cognitive functioning in individuals with high neuroticism scores. Since cognitive dysfunctions sometimes persist after remission of depression, the present study investigated the effects of -lactalbumin-enriched diet on cognition in recovered depressed patients.

Twenty-three recovered depressed patients and 20 healthy matched controls without a history of depression consumed meals rich in -lactalbumin or casein protein in a double-blind crossover design. Mood, cognitive function and plasma amino acids were assessed at both sessions before and after dietary intake.

Alpha-lactalbumin protein had no effect on mood, but improved abstract visual memory and impaired simple motor performance. These effects were independent of history of depression. Supplements of lactalbumin may be useful for nutrition research in relation to age- or disease-related memory decline. The present findings should be further examined in different (e.g. medicated) samples. The long-term effects of -lactalbumin should also be investigated.

Key Words: serotonin • depression • cognition • memory • tryptophan • alpha-lactalbumin

This version was published on July 1, 2006

Journal of Psychopharmacology, Vol. 20, No. 4, 526-535 (2006)
DOI: 10.1177/0269881105057466


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