• Tom

How Processed Food Is Changing Your Brain!

Updated: 4 days ago

Before you understand the effects processed foods have on our brain, it's important you understand why our body stops eating & 'feels full' in the first place


Why do we stop eating or 'feel full'?

When we eat, 2 things happen in our body to tell us to stop eating

1. Gastric distension

When we eat, our stomach expands. As your stomach is expanding, a signal is sent to the brain to let it know how full it is & when it should stop


2. Hormonal satiation

When we start to digest that food, the gut begins to release hormones to let the brain know more about the food, different foods release different hormones

- These hormones can stick around too.This is why having a high protein breakfast can prevent us overeating at lunch, for example.

Your brain drives your food consumption over time

The body has a system for managing your long term energy & nutrient needs. It's called the Leptin Feedback Loop


My opinion: leptin is the key area the world needs to focus on to fight obesity


Leptin is a hormone that regulates your body weight. It's released by body fat. Leptin's job is to tell our brain how much energy we've consumed and how much we have spare (body fat) - it's designed to ensure we have the energy to survive


Your brain makes decisions based on leptin levels such as: Hunger, Calorie intake, Nutrient absorption, Energy use, Energy storage


Stable body fat = high leptin= Happy body, normal appetite, good energy levels etc.


Reduced body fat = reduced leptin= Increased hunger, less energy, burn less calories through exercise, metabolic rate slows


Unfortunately, high body fat does not guarantee less hunger (annoying, I know- I will explain why later)


As leptin is designed for survival, it's great for maintaining body weight. However, it does make losing weight more difficult (when we evolved, becoming overweight wasn't usually a concern for the body. Have you ever seen a fat animal in the wild?)

The Food You Eat Can Change Your Brain

If our bodies are so great at regulating how full we feel & when we should stop eating, why are so many people overweight?


This is largely due to processed food & the effects it plays on the brain (plus how easy it is to obtain).


Processed food, generally, is designed to be hyper-palatable & rewarding.


Hyper Palatable- "too good" "can't stop eating" foods

Reward value - foods such as; coffee, alcohol, high sugar, deep fried all have a high reward (fun) value


  • We go out of our way/will pay a lot for & make room even when we're full (think a £8 chocolate waffle at the market)

  • A diet filled with hyper-palatable, rewarding, processed foods can overthrow the brains "stop" signals

  • This type of diet prevents leptin regulating energy balance, it can even make our brains inflamed + leptin resistant


Tasty (palatable) + fun (high reward) = no off switch

These are foods that contain 1 or usually multiple of the following: Energy dense - High fat - High sugar - Salty - Sweetness - Pleasing texture - Drugs (caffeine, alcohol etc.)


We have evolved as hunter gatherers to seek these things for survival (although each of the above are usually only found individually in nature) so when a food is processed to contain multiple (or all) our brain has no chance of saying no


Too much processed energy dense food can cause Hypothalamic inflammation

Disrupting the Leptin Feedback Loop

Hypothalamic inflammation causes the brain to ignore the leptin


The brain begins to panic as it thinks it's not getting leptin, therefore doesn't have enough reserved energy to survive - so what does it do? It tries to create more


As leptin is released from body fat, guess what the body thinks it needs? More body fat - so it signals hunger until you create more body fat. It will continue to do this until it thinks it has enough leptin


High body fat + high leptin can & will become your bodies new normal & even with high body fat (plenty enough to survive) the body will still want to preserve it and 'worry' when it begins to lose any.


This is your new leptin feedback loop

Change What You Eat, Change Your Brain

Fortunately, with a little work - it is possible to fix your leptin feedback loop & reduce the leptin resistance you may have caused over consuming processed foods


3 steps to get our natural appetite regulation system back on track & do it's job better


1. Eat more whole, fresh, minimally processed foods

2. Eat slowly & mindfully

- Slowing down helps your brain & GI tract communicate

3. Eat fewer processed, hyper palatable foods


Steps 1 & 2 will help make 3 easier


Consistency will:

- Reduce cravings, feel fuller for longer (leptin loop returns to normal), help lose body fat, feel, move & perform better

Food Intake Is Complex

Physiology, psychology, relationships + society, culture, lifestyle, individual knowledge, personal beliefs about food/eating all play a role


So don't feel guilty when you're trying to lose weight.

Toms Top Tips

1) Recognise your body is a system. Think long term.

- What you do today, can effect can effect tomorrow can


2) Eat mostly whole, minimally processed foods.

- Low calorie, hard to overeat, nutritious - no inflammation / leptin resistance


3) Plenty of protein

- Satiety superstar


4) Plenty of vegetables

- Healthy, high volume, low calorie


5) Aim for 1 a 'minimal ingredient' meal per day

- Think of foods such as: chicken, potatoes, carrots, peas, salmon, rice etc. Basically foods that when you read the ingredients it will pretty much just be the item you've bought

- If you look at a ready meal box, there could be 10, 20, 30+ ingredients on the box (very processed)


These steps may seem a little boring, but think about step 1. A little work for a few weeks now, can help you for the rest of your life.


Not a bad trade off, if you ask me!

Want to know the 5 steps I use with my clients to help them lose weight? Check out my latest free eBook '5 Steps To Successful Fat Loss' here


If you're struggling with your appetite or saying no to foods, drop me a message & let's see if together we can help you!

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