Portioning your weekly meals into plastic or even BPA-free    containers packs some major risks. Among them is weight gain.        
      If your Sunday nights are dedicated to meal prepping for the      week ahead, youre part of a mighty group of health nuts.    
      The planning ahead of meals is a main tip of weight loss      coaches, food bloggers and nutritionists.    
      Indeed, meal preppings popularity has exploded on social      media. On Instagram alone there are 5.5 million photos tagged      #mealprep and 1.1 million tagged #foodprep.    
      While perfectly portioned-out food for seven days does make      for the perfect #foodporn snapshot, meal preppers are onto an      idea that  at least in concept  is good for your diet,      according to research.    
      People who spend more time preparing meals are more likely to      have healthier diets, according to a 2014 study published in      the American Journal of Preventive      Medicine.    
      They eat more fresh fruits and vegetables.    
      They also eat at fast food restaurants only half as often as      people who only spend less than an hour each day prepping and      cooking their meals.    
      In addition, they spend less money on food.    
      More recently, a 2017 study of 40,000      adults in France found that people who meal prepped at least      a few days at a time were less likely to be overweight and      stuck more closely to nutritional guidelines.    
      The survey also found that meal prepping led to more food      variety over the week.    
      Portion control is one key way food prepping helps people      maintain a healthy weight or lose a few pounds.    
      A review of several studies      around the role of portion control in weight management      showed that eating the appropriate amount of food is directly      linked.    
      One component of portion control that researchers stress is      choosing the right portions of water-rich foods, like fruits      and vegetables, and eating less energy-dense foods  like      most fast foods and candy.    
      If you prep your food, its easier to not only eat the right      amount, but to avoid foods that are bad for you but      oh-so-tempting.    
      However, if youre portioning food out into plastic      containers, all of that healthy preparation could actually      create a new barrier to staying trim.    
      Dr. Aly Cohen, a rheumatologist, as well as an integrative      medicine and environmental health specialist who is on staff      at the CentraState Medical Center, explained.    
      An effective diet is not just about healthy eating, managing      sugar and carbohydrates, and exercise, she told Healthline.      Reducing chemical exposure is also key because many of these      chemicals can disrupt normal hormone function, impede weight      loss, and even cause weight gain. Just because chemicals may      not have an obvious effect, like causing a rash, doesnt mean      they arent tinkering with your body.    
      Whipping up a big batch of healthy chili, scooping it out      into several plastic containers, and quickly reheating it in      the microwave come mealtime is one example of how a healthy      meal prep turns into several dinners brimming with the      harmful hormone-disrupting chemical bisphenol A (BPA).    
      BPA is found in polycarbonate plastic (plastic #7) and canned      food linings, as well as many other things that we touch      every day  including our smartphones.    
      Most human exposure to BPA is through ingestion from canned      products, but BPA can also be absorbed by touching paper that      uses BPA to seal ink onto its surface [e.g., receipts,      airplane and parking tickets, currency] and then touching      your hands to your lips. BPA can also be absorbed in smaller      amounts through the skin, Cohen said.    
      Cohen noted that BPA is pervasive  8 billion pounds of BPA      are made every year  since its one of the cheapest ways to      make packaging.    
      BPA and  if your plastic container is marked BPA-free       similar, sometimes more harmful chemicals are lurking in your      plastic food storage set of containers.    
      Heating up plastic containers by putting hot food in them or      microwaving them can draw out BPA  right into your food.    
      BPA was first discovered in 1891 and then rediscovered in      1936, according to Cohen.    
      It was used as an estrogen replacement drug for women, and      it was also used to fatten poultry and cattle. In the 1940s      it was discovered that linking the molecules together created      a hard, clear, glass-like plastic, she said.    
      BPA can confuse the endocrine system, which regulates      hormones, by mimicking estrogen.    
      Were regularly ingesting BPA, and therefore continually      disrupting the messages that help our bodies function      properly. In fact, according to the Centers for Disease      Control and Prevention (CDC), more than 90 percent of people have      detectable levels of BPA in their systems.    
      To date, nearly 100 studies have been published tying BPA to      various health problems, from diabetes and cardiovascular      disease to infertility, according to the Endocrine Society      and IPENs Introduction to      Endocrine-Disrupting Chemicals.    
      Some other effects of too much BPA exposure are directly      contrary to weight loss and healthy eating goals.    
      BPA passes through a persons system fairly quickly, but      detoxifying still isnt easy.    
      Despite the fact that BPA has a short half-life of six      hours, which means an exposure will wash out over a day or      so, people continue to have high blood levels, Cohen noted.    
      There are two problems with BPA, added Laura Vandenberg,      PhD, a spokesperson for the Endocrine Society, and an assistant professor of      environmental health at the University of Massachusetts      Amherst. One is that we are constantly exposed in our      environment, so the levels never really seem to drop. Even in      people that have been fasting, metabolite levels in urine are      still detected. The second problem is that, if exposures      occur during a vulnerable period of development, like fetal      development, the effects can be permanent  even if exposures      cease.    
      For adult meal-planning fanatics, constant re-exposure to BPA      may mean that meal prepping is actually sabotaging your diet.    
      BPA is so ubiquitous, that humans are continuously exposed,      making BPA pseudo-persistent, Cohen said. Whats      interesting in terms of weight is that BPA can turn stem      cells into fat cells and make fat cells turn larger. Thats      not great news for our waistlines  let alone our overall      health.    
      A study published in Environmental Health Perspectives in 2015 was      the first study to prove that BPA-glucuronide (BPA-G), which      accounts for 80 to 90 percent of the metabolites your liver      produces when processing BPA, doesnt just get excreted from      your body.    
      The researchers showed that BPA is an active agent that can      prompt cells to become fat cells.    
      Thats not the only proven way that BPA exposure can      interfere with your weight goals.    
      A recent study published in Endocrinology found      that BPA exposure makes it much harder for you to feel full.    
      While meal prepping helps with portion control, the BPA in      the plastic food storage containers may ironically be causing      people to want to eat larger portions.    
      Even buying plastic containers marked BPA-free doesnt      protect you from the harmful effects of plastic.    
      Some BPA-free products can actually release      estrogen-simulating chemicals that are more potent than BPA.    
      Many products are now labeled BPA-free. However, BPA is      often replaced with bisphenol S [BPS] and bisphenol F [BPF],      which are less studied but appear to have similar      hormone-disrupting effects, Rebecca Fuoco, MPH, director of      Health Research Communication Strategies, told Healthline.    
      That means scientists and activists that study toxic      chemicals like BPA and push to remove them from everyday      products often end up spending a lot of time trying to figure      out whats in the new compound.    
      When a chemical is found to be harmful, manufacturers change      the molecule ever so slightly and put it out to market      again, noted Cohen. From BPA came BPS, BPF, and BP-FB,      which are molecules that have been found thus far to have      more harmful effects than the chemical they were designed to      replace  also known as regrettable substitutions.      Researchers are essentially playing whack-a-mole, because      plastics and their ingredients are proprietary and considered      trade secrets, so the recipes and ingredients are not      shared with researchers or consumers.    
      In 2012, 4.7 million metric tons      of BPA, valued at about $8 billion, was estimated to have      been produced, according to GlobalData.    
      And reports of the harmful effects arent slowing production.      The demand for BPA has risen 6 to 10 percent annually.    
      Oleoresin is a vegetable-based alternative that can add about      two cents to the cost of manufacturing of cans, according to      Cohen.    
      So far, it has only been used in a small percentage of cans      on the market.    
      Our government has given more priority to manufacturers than      to consumers. The vast majority of food packing ingredients      are going out to market without ever being tested for      toxicity, Cohen said.    
      In addition, the Food and Drug Administration      (FDA) still considers BPA to be safe, stating on its      website that their research has showed that BPA is rapidly      metabolized and eliminated through feces and urine.    
      On the other hand, regulatory agencies in Europe have      recently re-evaluated BPA. Last week, there was widespread      agreement by countries in the European Union that this      chemical should be labeled a human endocrine disruptor.    
      For Americans, though, toxic chemicals like BPA remain a      concern.    
      We shouldnt expect individual consumers to have detailed      knowledge of chemistry to make safe decisions for themselves      or their families. Safety decisions should be made by      regulators using the best available evidence. I will continue      to push for improved regulations that use modern data to      protect public health, Vandenberg told Healthline.    
      Even though BPA-riddled plastic containers are out there,      Vandenberg and Cohen noted that people can still make small      changes over time that add up.    
      Here are some ways to ensure your food containers arent      keeping you from losing weight.    
      Meal-prepping in plastic is still better than no meal      prepping at all, if it helps you eat healthier.    
      These chemicals are ubiquitous  theyre everywhere. You      should do the best you can. Cutting chemicals out of your      life is a journey, not a race. Every day I learn something      new and try to add it into my life, Cohen said.    
      This story was originally      published on Healthline.com.    
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