Categories
Wellness

Time-restricted Eating vs. Calorie Restriction

  1. Time-restricted eating, e.g., Eating from noon to 8 PM only
  2. Calorie restriction, e.g., a 25% reduction

Given the widespread problem of obesity, there is considerable interest in both techniques as a means to lose weight. Recently, time-restricted eating has gained popularity because of its seeming simplicity.

A 12-month RCT study (1) of weight loss methods found that both techniques resulted in an average 5% reduction in body weight. The authors noted that time-restricted eating is both effective and feasible across a diverse population. In another RCT study, (2) both groups ate a low-calorie diet whilst one group also undertook time-restricted eating. The study conclusion: “Among patients with obesity, a regimen of time-restricted eating was not more beneficial with regard to reduction in body weight, body fat, or metabolic risk factors than daily calorie restriction.”

The theory behind time-restricted eating is that after a period of hours without eating, the body switches from a ready supply of energy from food, to burning its fat resources. (3) This is a theory without research support currently. One study (4) found, following a 10-day fast, that, to quote the BBC article, (3) “the weight loss by a group of male subjects, during the early stages of the fast was predominately a loss of water, protein and other lean tissue rather than fat loss.”  

In addition, it is important during the time-restricted eating period to eat a balanced diet. If one goes from three meals to two meals, there is a risk of the diversity of food inputs declining.

In addition to a balanced diet, and when the body receives it, another factor to consider is the efficiency with which the body processes it. Please see our blog posts on the gut microbiome, e.g., “Diet, Gut Microbes, and Health”, of 30 June 2021

References:

  1. Time-Restricted Eating Without Calorie Counting for Weight Loss in a Racially Diverse Population: A Randomized Controlled Trial, by Shuhao Lin et al, July 2023
  2. Calorie Restriction with or without Time-Restricted Eating in Weight Loss, by Deying Liu et al, April, 2022
  3. https://www.bbcgoodfood.com/howto/guide/what-intermittent-fasting-diet
  4. Is muscle and protein loss relevant in long-term fasting in healthy men? A prospective trial on physiological adaptations, by Claire Laurens et al, October 2021

Categories
Wellness

Nutritional Benefits of Eating Seaweed

Seaweed are algae that grow along rocky shorelines. Alternative names in English are sea vegetables or sea greens. In Japanese common names include wakame and nori.

Seaweed and leafy green vegetables have similar nutritional benefits.

Wakame is nutrient-dense, low in fat as well as an amazing source of omega-3s, which lowers the risk of heart disease, depression, and arthritis. Seaweed is rich in minerals and iodine, supports thyroid hormones and improves skin health. (1) Scientific research support is presented in the background paper available here.

Seaweed is normally classified into three groups by the leaf color: green, brown and red. Shallow waters receive a lot of sunlight, and the algae are green. Next is brown. Red algae are found in the depths. For examples of the different types of edible seaweed, please click here.

Some examples of seaweed in Japanese cuisine follow.

Nori is the “sushi seaweed”, and is particularly dense in protein, around 40% protein by weight.

Kombu is the seaweed in miso soup, being one of the main ingredients of dashi, used as the broth.

Wakame most commonly appears in Japanese salads.

Mekabu is the edible part of the wakame plant root. In Japan it is sold both fresh and dried.

Categories
Wellness

Nutrition and Tofu

Tofu is the result of a process that combines soybeans (in most cases) with a coagulant, curing agent.

Soybean is a bean providing vegetable protein. It contains all the amino acids that the body needs. The coagulant contributes minerals. Calcium Sulfate, for example, is a naturally occurring calcium salt.

Soy foods such as tofu are well known for their cholesterol-lowering effects. The evidence is so strong that regulators in the United States and Canada have approved health claims linking soy protein to a lower risk of heart disease. (1, 2)

Tofu contains isoflavones, which is a compound with antioxidant and anti-inflammatory properties.

The isoflavones in tofu are also believed to reduce the risks of diabetes (3, 4) and cancer. (5, 6) Whilst research is supportive, more studies are needed to make strong statements.

For more details, please see the four page background paper here.

References:

  1. Healthline: https://www.healthline.com/nutrition/what-is-tofu
  2. Beyond the Cholesterol-Lowering Effect of Soy Protein: A Review of the Effects of Dietary Soy and Its Constituents on Risk Factors for Cardiovascular Disease, by D. Dan Ramdath, Emily M. T. Padhi, Sidra Sarfaraz, Simone Renwick, and Alison M. Duncan, 2017
  3. Legume and soy intake and risk of type 2 diabetes: a systematic review and meta-analysis of prospective cohort studies, by Jun Tang, Yi Wan, Minjie Zhao, Hao Zhong, Ju-Sheng Zheng, Fengqin Fen, 2020
  4. The Effect of Soy Intake on Metabolic Profiles of Women with Gestational Diabetes Mellitus, by Mehri Jamilian, Zatollah Asemi, 2015
  5. Soy, Soy Isoflavones, and Protein Intake in Relation to Mortality from All Causes, Cancers, and cardiovascular diseases: A Systematic Review and Dose-Response Meta-Analysis of Prospective Cohort Studies, by Seyed Mostafa Nachvak, Shima Moradi, Javad Anjom-Shoae, Jamal Rahmani, Morteza Nasiri, Vahid Maleki, Omid Sadeghi, 2019
  6. Soy and isoflavones consumption and breast cancer survival and recurrence: a systematic review and meta-analysis, by Shumin Qiu, Chongmin Jiang, 2018
Categories
Wellness

Nutrition & Japanese Beef

Beef is contentious, as it is a red meat (pork, lamb, veal, beef) and the scientific recommendation is to limit red meats. For example, the world-renowned Cleveland Clinic recommends limiting red meat to one to two meals a week, to about 170 grams in total (1) The World Cancer Research Fund International is more lenient, recommending per week a limit of three (larger) portions, to about 350 to 500 grams in total (2) The U.K. NHS recommends a daily limit of 70 grams (equivalent to 490 grams a week). (3)

If you are eating red meat, this still leaves room for choices. Beef is essentially protein with varying quantities of fat. We recommend considering Japanese beef for its relatively superior fat profile.

Wagyu is a Japanese word that means “Japanese beef”. However, the word has passed into more global usage, and is now also used as follows. Wagyu cattle includes four Japanese breeds; Black, Brown, Shorthorn, and Polled. Today, the renowned brand name Wagyu includes not only cattle produced in Japan, but also cattle produced in countries such as Australia and the United States. (4)

Importantly, the Wagyu breed produces carcass lipids containing relatively higher concentrations of mono-unsaturated fatty acids (MUFA). (5, 6, 7) These are otherwise known as “good” fat and act to lower cholesterol. (8, 9, 10) The human body uses MUFA for energy and cell growth.

Fat has been reported as having fewer adverse effects on health than carbohydrates, especially simple carbohydrates. (4, 11)

For more details please see the paper here.

References

  1. Is Red Meat Bad for You? by Cleveland Clinic: https://health.clevelandclinic.org/is-red-meat-bad-for-you/
  2. Limit Red and Processed Meat, by The World Cancer Research Fund International: https://www.wcrf.org/diet-activity-and-cancer/cancer-prevention-recommendations/limit-red-and-processed-meat/#:~:text=Dietary%20goal,%2C%20if%20any%2C%20processed%20meat.
  3. Meat in your Diet, by the NHS: https://www.nhs.uk/live-well/eat-well/food-types/meat-nutrition/
  4. The Japanese Wagyu Beef Industry: current situation and future prospects — A review, by Takafumi Gotoh, Takanori Nishimura,Keigo Kuchida, and Hideyuki Mannen, June 2018
  5. Effect of breed type and sex on the fatty acid composition of subcutaneous and intramuscular lipids of finishing steers and heifers, by Zembayashi M, Nishimura K, Lunt DK, Smith SB., 1995
  6. Fatty acid composition of subcutaneous and intramuscular adipose tissues and M. longissimus dorsi of Wagyu cattle, by Sturdivant CA, Lunt DK, Smith GC, Smith SB., 1992
  7. Relationship between myofiber type and fatty acid composition in skeletal muscles of Wagyu (Japanese Black) and Holstein cattle, by Gotoh T, Olavanh S, Shiota M, et al., 2011
  8. Role of beef and beef tallow, an enriched source of stearic acid, in a cholesterol-lowering diet, by M A Denke, 1994
  9. Incorporation of lean red meat into a National Cholesterol Education Program Step I diet: a long-term, randomized clinical trial in free-living persons with hypercholesterolemia, by D B Hunninghake 1, K C Maki, P O Kwiterovich Jr, M H Davidson, M R Dicklin, S D Kafonek, 2000
  10. Cholesterol-lowering effect of a low-fat diet containing lean beef is reversed by the addition of beef fat, by K O’Dea 1, K Traianedes, K Chisholm, H Leyden, A J Sinclair, 1990
  11. Effects of a low-carbohydrate diet on weight loss and cardiovascular risk factors in overweight adolescents, by Sondik SB, Copperman N, Jacobson MS., 2003
Categories
Wellness

Soba: It’s Good for You

The Japanese word for buckwheat is soba. Buckwheat is known for its high mineral and anti-oxidant content. It has little fat. Soba is a staple of the Japanese diet.

The study “Buckwheat: A Useful Food and it’s Effects on Human Health” (1) concludes:

Buckwheat is a food with rich nutrient content and important functional properties. In addition, it does not lose these properties in the processing stages, it also enriches the products it is added to both nutritionally and functionally. Because of these properties, it can show positive effects such as antioxidant, antihypertensive, antidiabetic on human health.

In particular, soba has health benefits for the heart. For more details, please see the four-page paper here.

The above is important to know as the price of soba increases. Japan only produced 42% of its buckwheat consumption domestically in 2020, according to the Japan Soba Association. Russia is the world’s largest exporter. European buckwheat average prices are up 50% 2022 versus 2021 (Euro 4.11 versus Euro 2.65). (2)

References:

  1. Buckwheat: A Useful Food and it’s Effects on Human Health, by Haci Omer Yilmaz, Nurcan Yabanci Ayhan, and Cagdas Salih Medic, 2018
  2. https://eng.lsm.lv/article/economy/economy/economists-prices-in-latvia-will-continue-rising.a458372/