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When mice are given liraglutide, the usual dopamine spike caused by nicotine is reduced in the brain’s reward center.
Descriptive
A drug that activates GLP-1 receptors makes certain brain cells in mice more active — specifically ones that control appetite and reward.
Giving mice both nicotine and a diabetes drug called liraglutide together helps them lose weight by making them eat less and burn more calories.
Even small changes in how much protein is in a meal — not huge amounts — can help people feel fuller and eat less, whether they’re lean or obese.
Fat doesn’t make obese men feel as full or eat less as it does in lean men, meaning their bodies respond differently to fatty foods.
Meals with enough or lots of protein make two key hunger hormones (CCK and ghrelin) stay active longer in both lean and obese men, which might help them feel full longer.
Obese men feel less hungry after eating high-protein meals and eat less afterward when they eat meals with more protein, no matter if it's high-protein or just enough protein.
When lean men eat meals with more fat or protein instead of lots of carbs, they feel less hungry, fuller longer, and end up eating less food later.
Whether a rat is hungry or just ate, and what it’s been eating before, changes the levels of two key brain chemicals in its reward center.
If a rat has been eating lots of sugary treats, and then is given regular food after being hungry, its brain’s serotonin activity goes down—no matter if it was stressed or not.
When rats are stressed and eat sugary food, their brain’s chemical balance changes differently when they’re hungry versus when they eat again—especially in the area linked to pleasure and reward.
When stressed rats eat sugary food after being hungry, their brain's serotonin activity goes up—but if they’ve been eating sugary food for a while and then eat normal food, serotonin activity drops.
When rats eat lots of sugary, fatty food for a long time, their brain's pleasure center becomes more active with dopamine, which might make them keep eating even when they don't need to.
Researchers asked people how hungry or full they felt using a simple line scale after giving them gum with nicotine and/or caffeine.
A moderate amount of nicotine with caffeine doesn’t make people feel sick and still helps reduce hunger, making it a good balance.
A strong combo of nicotine and caffeine made some people feel sick, but even when those people were removed from the data, the appetite-suppressing effect still held up.
When caffeine is added to nicotine gum, it makes the nicotine work even better at making you feel less hungry and more full.
Causal
Chewing gum with nicotine makes you feel less hungry and more full, so you might not want to eat as much.
When you eat, not just the 'pleasure centers' light up—bigger thinking areas of your brain also get involved, helping you decide whether to keep eating.
Your brain doesn’t just care about how food tastes—it also cares about what it does for your body, and both things together make you want to eat more.
When your brain reacts strongly to the taste of food right away, it seems to dial down the later dopamine surge from your stomach feeling full—like your brain is balancing taste and nutrition.
The more you want to eat something, the more dopamine shows up in certain brain areas that track desire—your brain’s ‘I want more’ signal.
When you eat tasty food, your brain releases dopamine right away from the taste, and then again later from your body sensing the nutrients—two different brain areas handle each part.
Even when methylene blue was given with another drug called lithium, it still didn’t help the ALS mice live longer or move better.