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Clin Nutr. 2018 Sep 19. pii: S0261-5614(18)32448-8. doi: 10.1016/j.clnu.2018.09.010. [Epub ahead of print]

Probiotic Lactobacillus plantarum P8 alleviated stress and anxiety while enhancing memory and cognition in stressed adults: A randomised, double-blind, placebo-controlled study.

Author information

1
School of Industrial Technology, Universiti Sains Malaysia, 11800, Penang, Malaysia.
2
School of Medical Sciences, Universiti Sains Malaysia, 16150, Kubang Kerian, Malaysia.
3
School of Data Sciences, Perdana University, 43400, Serdang, Malaysia.
4
Advanced Medical and Dental Institute, Universiti Sains Malaysia, Bertam, Malaysia.
5
Community Health Center, Universiti Sains Malaysia, 11800, Penang, Malaysia.
6
Key Laboratory of Dairy Biotechnology and Engineering, Ministry of Education, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia, 010018, China.
7
Key Laboratory of Dairy Biotechnology and Engineering, Ministry of Education, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia, 010018, China. Electronic address: hepingdd@vip.sina.com.
8
School of Industrial Technology, Universiti Sains Malaysia, 11800, Penang, Malaysia. Electronic address: mintze.liong@usm.my.

Abstract

BACKGROUND & AIMS:

To investigate the effects of probiotic in alleviation of stress in stressed adults, along our focus to identify and justify strain specificity on selected health benefits with a precisely targeted population.

METHODS:

This 12-weeks randomized, double-blind and placebo-controlled study investigated the effects of a probiotic (Lactobacillus plantarum P8; 10 log CFU daily) on psychological, memory and cognition parameters in one hundred and three (P8 n = 52, placebo n = 51) stressed adults with mean age of 31.7 ± 11.1 years old. All subjects fulfilled the criteria of moderate stress upon diagnosis using the PSS-10 questionnaire.

RESULTS:

At the end of study, subjects on P8 showed reduced scores of stress (mean difference 2.94; 95% CI 0.08 to 5.73; P = 0.048), anxiety (mean difference 2.82; 95% CI 0.35 to 5.30; P = 0.031) and total score (mean difference 8.04; 95% CI 0.73 to 15.30; P = 0.041) as compared to placebo after 4-weeks, as assessed by the DASS-42 questionnaire. Although plasma cortisol levels were only marginally different between placebo and P8 (mean difference 3.28 ug/dl; 95% CI -7.09 to 0.52; P = 0.090), pro-inflammatory cytokines such as IFN-γ (mean difference 8.07 pg/ml; 95% CI -11.2 to -4.93; P < 0.001) and TNF-α (mean difference 1.52 pg/ml; 95% CI -2.14 to -0.89; P < 0.001) showed higher reduction as compared to placebo over 12-weeks. These were accompanied by enhanced memory and cognitive traits such as social emotional cognition and verbal learning and memory upon administration of P8 as compared to the placebo, with different effects in women as compared to men.

CONCLUSIONS:

The present data illustrated that L. plantarum P8 is a feasible and natural intervention for the alleviation of selected stress, anxiety, memory and cognitive symptoms in stressed adults.

TRIAL REGISTRATION:

Approved by the JEPeM-USM Review Panel on Clinical Studies (Approval number USM/JEPeM/16050195) and was registered at ClinicalTrials.gov (identifier number NCT03268447).

KEYWORDS:

Anxiety; Cognition; Gut-brain-axis; Lactobacillus plantarum P8; Memory; Stress

PMID:
30266270
DOI:
10.1016/j.clnu.2018.09.010

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