Lactobacillus casei
Lactobacillus casei is one of the most studied probiotics because of its diverse health benefits. This bacterium is found in the intestine and mouth and as a lactic acid producer, it has been found to assist in the propagation of beneficial bacteria in the digestive system. Lactobacillus casei is known to have a high resistance to fluctuations in temperature and pH levels in the gut, allowing it to survive in a harsh environment. This health-enhancing bacterium is used an active ingredient in cheddar cheese, yogurts, and in fermented dairy and plant products. It is also available in the form of supplements or capsules in many health food stores.
Benefits of Lactobacillus case
The immense health benefits of Lactobacillus casei are backed by strong scientific evidence. Among them are the following:
Strengthens the Immune System
Evidence suggests that different strains of probiotics can help boost the immune function by increasing the activity and production of immune system cells. In one study, researchers found that supplementation of Lactobacillus casei along with other probiotic strain in healthy individuals increased the activity of natural killer cells and T helper 1 cytokines, indicating an improved immune function.[1] In another study, endurance athletes supplemented with fermented milk containing Lactobacillus casei daily for 16 weeks while training during the winter months experienced a lower prevalence (36% lower) of upper respiratory tract infection (URTI) symptoms compared to the placebo-treated group.[2]
Maintains a Healthy Digestive System
Probiotics such as Lactobacillus casei are generally considered safe and potentially beneficial in digestive health. Researchers in a 2007 trial studied the effects of a probiotic drink containing Lactobacillus casei.[3] They concluded that this treatment may help reduce the prevalence of antibiotic-associated diarrhea and Clostridium difficile–associated diarrhea without any adverse side effects. In a similar study, researchers found that regular intake of milk fermented with Lactobacillus casei can help improve bowel habits of people with chronic constipation.[4]
Prevents Cancer
Results from a randomized controlled study show that Lactobacillus casei may prevent the progression of cancer. In one study, oral administration of a Lactobacillus casei preparation at 3 grams per day in patients who had undergone surgical removal of cancerous bladder tissues prevented the recurrence of bladder cancer.[5]
Improves Mood
When researchers treated 20 healthy participants with Lactobacillus casei W56 along with other probiotic strain for 4 weeks, a significant in improvement in mood, rumination and aggressive thoughts was observed.[6]
Improves Symptoms of Rheumatoid Arthritis (RA)
Joint inflammation in RA is one of the most debilitating symptoms of this inflammatory disorder. Interestingly, one study found that Lactobacillus casei 01 supplementation at one capsule per day for 8 weeks was effective in reducing tender and swollen joints as well as inflammatory markers of RA in the blood such as high-sensitivity C-reactive protein.[7] Also, the patients experienced a significant improvement in their quality of life.
References:
1. Dong H, Rowland I, Yaqoob P. Comparative effects of six probiotic strains on immune function in vitro. Br J Nutr. 2012;108(3):459-70.
2. Tiollier E, Chennaoui M, Gomez-merino D, Drogou C, Filaire E, Guezennec CY. Effect of a probiotics supplementation on respiratory infections and immune and hormonal parameters during intense military training. Mil Med. 2007;172(9):1006-11.
3. Hickson M, D’souza AL, Muthu N, et al. Use of probiotic Lactobacillus preparation to prevent diarrhoea associated with antibiotics: randomised double blind placebo controlled trial. BMJ. 2007;335(7610):80.
4. Koebnick C, Wagner I, Leitzmann P, Stern U, Zunft HJ. Probiotic beverage containing Lactobacillus casei Shirota improves gastrointestinal symptoms in patients with chronic constipation. Can J Gastroenterol. 2003;17(11):655-9.
5. Aso Y, Akazan H. Prophylactic effect of a Lactobacillus casei preparation on the recurrence of superficial bladder cancer. BLP Study Group. Urol Int. 1992;49(3):125-9.
6. Steenbergen L, Sellaro R, Van hemert S, Bosch JA, Colzato LS. A randomized controlled trial to test the effect of multispecies probiotics on cognitive reactivity to sad mood. Brain Behav Immun. 2015;48:258-64.
7. Alipour B, Homayouni-rad A, Vaghef-mehrabany E, et al. Effects of Lactobacillus casei supplementation on disease activity and inflammatory cytokines in rheumatoid arthritis patients: a randomized double-blind clinical trial. Int J Rheum Dis. 2014;17(5):519-27.