For me it was more hot drinks than anything. I would get an increase in the uptake of mercury from my amalgams after drinking hot fluids. Not "so" much from hot food, because it wasn't nearly as hot as the cups of teas or other hot drinks I had.

Moderate exercise was also helpful for me with mercury poisoning. Helped with circulation, sweating, lungs etc and in doing that, naturally I expelled some toxins and I'm sure some metal as well, though it's not "chelation", it was still helpful. By moderate exercise, I mean walking (outdoor and/or treadmill) and rebounding on a rebounder can also be helpful. I found walking the best for me personally. Putting my treadmill on an incline increased the intensity enough to make me sweat more and puff a little more. I did not overdo it, as overdoing exercise can also have the effect of too many toxins being mobilised at once.

I had hot baths to help induce sweating and would add a cup or so of epsom salts (or combination of baking soda and sea salt). This helped also. Only have the bath as hot as you can tolerate. Do not have it where it makes you feel light-headed/woozy. The added epsom salts/baking soda/sea salt help with inducing sweating also.

Antioxidants like a good quality vitamin C (powder form containing bioflavanoids worked best), vitamin E, and selenium (taken 2 hours away from vitamin C for more effectiveness) helped me with mercury. Mercury free fish oil (molecularly distilled) too. Those were the bare minimum however. If you react too strongly and badly to selenium, you may have to lower the dose, or stop taking it if it's clear it's not for you. It does appear to have an effect with mercury. Though it is thought of as protective and helpful in mercury toxic situations because it competes with mercury for binding sites and is one of the elements mercury depletes. I heard it maybe better tolerated in the form of selenomethione. I would not take anymore than 150 - 200 mcg personally.

Avoiding sugar is very wise, as it seems you are doing. This is essential in my opinion. Sugar lowers immunity, upsets blood sugar levels and aggravates or even causes yeast problems. Also, another one is wheat/gluten. Typically causes problems. I hear wheat is treated with mercury fungicide, but also contains gluten. Gluten intolerance can be common in those suffering from mercury/candida, because some of us cannot digest the gluten properly. In fact, when I used to consume wheat/gluten, I'd get almost immediately poisoned by it. Basically anything containing gluten. I had no idea it was impacting my health as much as it was. Getting rid of sugar/gluten/wheat/ and yeast (as I had candida) had a very positive impact on my health, even with amalgams still in my mouth. But I had a few weeks of detoxification/die off to go through beforehand after I had eliminated them however. Not fun, but it was worth it for the results.

Diet is very important. Without changing it and eating healthy, I was unable to gain many (or any) benefits from supplementation. Which probably meant I could not absorb/utilise them properly. Once I got my gut/liver improved by getting rid of sugar/gluten/wheat/yeast, supplements became an added bonus.